Malicious PDF — malware analysis report

Static analysis result for SHA-256 3129044fa0112453…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 06:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 94d5f4c60cbeb949e2b1a2efebad511d SHA-1: c231dff3c9246c7261603e8e75459d85e4a063b3 SHA-256: 3129044fa0112453e0a5e71a80c7ff26ee16c3a163b24b415cffb8d5b360e351
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and multiple links to external resources, many of which point to compromised CMS uploads or disposable hosting. The document also contains a lure to execute commands via the clipboard, suggesting an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://www.hosotte.com/ckfinder/userfiles/files/zidap.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd792f1ef99---supalemasunulotasin.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/wukajopijexigebunomixum.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c612c28ec86---40263483709.pdfIn PDF document text
    • https://aneri12.eu/res/file/dofigidanogimogobipojuk.pdfIn PDF document text
    • https://temahr.hr/files/64377550496.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/24284332030.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1264b26201e44b5187e8e806df1eb72c/65823576755.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vidonalowurinikuwize.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/sth58f1s99rc31d35nl7i1v5mo/6019256615.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc65c62eb---figexerudezubotoxizigen.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/futanuvaramozepitonoxupe.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/60159196347.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/68053963575.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/99382878418.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/fofefuguderijutetakot.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/92603481325.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/230872b72dd0543c54e196b3c22a0d7a/rimiwonakidik.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/73d2f0bf925857d0fdd6442b1a6e813e/76093906914.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/roponefukez.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lamerixi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fd0896bfff6fb5c354b85420d2777d2/suxabetiwabofenerewaru.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u85v1numqjpk93mt3nlo15ir15/80315745398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=computer+keyboard+shortcuts+in+telugu+pdfPDF link annotation
    • 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 17068 bytes
SHA-256: 1d12b5c9afe3c62a26cc680f0c3a678bacc9137a30280b277726e16de7864ef0
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 11544 bytes
SHA-256: 927b1c5407106aeb4a917d0eae221ad8b6174e065d1eccda7b9e1c6d30695539
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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