Malicious PDF — malware analysis report

Static analysis result for SHA-256 167c20d72f496cd3…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af90cbc393255535afdd38afefb05ef8 SHA-1: 6a0e28d0d33a7ce0cc247aea8bd4ab4efb545b95 SHA-256: 167c20d72f496cd3435fc288e93ab470c8319bdda92b0b3554f61d8c8f681004
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure victims to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links to potentially compromised CMS uploads suggests a tactic to host malicious files or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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 https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f14c8f4f---kimarujodojukina.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0361e21cb3e2334f9efec53452a35b56/55722227796.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/74202061259.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6j9tgp5i9dsks0i21n4jqb3ci5/17749478993.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/60c28bfa2e3723e4466f29645edf20d0/kaporidaf.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/abd79f9ca0899651a5d7d120cd65da27/xepuzunuwawibam.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0b6436351dea543a488986f322e139af/siluzolokona.pdfIn PDF document text
    • http://altinay-law.com/images/file/ferijun.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/93949027052.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef41f80287---betowuzowuwunimelibiwekix.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gawasakanororomonozexe.pdfIn PDF document text
    • http://email-database.info/userfiles/file/7469098673.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zejazogibipawu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t9dmh428f6n7a06b0jinch1v66/45577822294.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb10d69341---gumit.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bf9c900d1c04e2d64ba23e8e136b66e/92110142480.pdfIn PDF document text
    • https://avenue102.com/uploads/file/71748170984.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609748e8cc26e---vedovitexujopekopumusugup.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c14b66fba---72440630837.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/106799b10c584e310aa23858039ed917/54146299447.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ffc8784---wazal.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/basesitujebuji.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074544165ccb---76635086528.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea09a14065---bonosewiligugomaviroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+music+to+a+certain+part+in+imoviePDF 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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10872 bytes
SHA-256: 04dcfbe201cc5fd43dfd9bcd523e666448347199593163c7b9f43f9c7d5cff26
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16864 bytes
SHA-256: 7aaf73ed42c82a04777698a4ce7a0012b6a52b72cc70d2de29f6250b30702b80

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