Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35a1f725cca29b4…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 17:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b687f9580c9cd73380b70881fb4d6c5 SHA-1: ce0082f93ed22a3fddbf08f67c4710cabb991461 SHA-256: f35a1f725cca29b442a9b15595b09fffda625691fc2ddf7d843cf3df5c8ec26e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The 'Clipboard command execution lure' heuristic indicates the document instructs users to copy/paste commands into a shell, a common tactic for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://17njl.com/userfiles/files/vasufeb.pdf In PDF document text
    • http://iphysiology.ru/upload/pumebot.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/33250354501.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d18ba497---xapemelikavirif.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/xifisoniduw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8413836c---56503572166.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/47372386177.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/55037325473.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/66058600665.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/95118244908.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/tavasavikazujulosu.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/mebedezesa.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/dipavizikojalurogi.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/83320094708.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/60090846909.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/27532404917.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161358845e535b---dewasodorubaxuxaxi.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9384816969.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/59528237777.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/vanuzame.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/42592348448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=diskpart+create+boot+partitionPDF 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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 17648 bytes
SHA-256: 1b49f33aa61c470b6ae95fd96a5f0910703990a6399cb03778f1536d2af050de
font_02_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 10552 bytes
SHA-256: fe6d3edfa83defc09863d0258d9eba43870e8db312fe9c9f3cf3cfda04d9ce41

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