Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2fb6857d4387a3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 11:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 33cc6816516e1ded1d25467c29642d62 SHA-1: 188f5edf3e54b6d1971e5a57422eb604068a9384 SHA-256: 0a2fb6857d4387a3d3384bb9feb5d8e975bcced9126fd9d17081e948854041b6
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised WordPress sites. The document employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to execute commands via the Run dialog or a terminal, likely to download and execute a second-stage payload. The presence of embedded JavaScript and the nature of the social engineering strongly suggest a malicious intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=replace+chrome+os+with+linux PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bef1a2182ea---88115717554.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb027db173---37668614371.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kirusipenunixotebaw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0a64ca70---56409390114.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/35782594135.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4fc5131a219c821eb872f2aee0c8a215/19943328983.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/zesoxurasazogurotil.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7565a5895fa3bdc108490c6b1a08d0cf/20803822200.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6a6ab3c7bfd2ad4b8370a2f7c9d42cbf/meropurepepumobewexif.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/54b2ad873bf7a94b4dcf277b244cc13a/2177276346.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/panuxu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa167c04c5c---74003875563.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/masezinulojegadafej.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d7a76bba8b3c74e01690a8845226c6e8/vivowufidawavizebe.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/webijojorubowupuweb.pdfIn PDF document text
    • http://imi.vc/upload/files/36855223258.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d7b0e6f---73315475207.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/bakojop.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbf6756d6---lewuzumepomewul.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b257aae401a---91923733497.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/55702967694.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/3412e5c21f308e63c2567f62a9b727eb/ninojozow.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/858fc6a18aa259bc77a3e1a464420b84/kubumotipaxarim.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/64153534073.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 18632 bytes
SHA-256: 4e773c2c351e5540e5c75fcb405702d1ab56ef4a580020dcfc2e20038bc99574
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10972 bytes
SHA-256: ac6af3c14b144edf3c1158158d82f82d4444d1e0359f52436d9b80acd2412006

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