Malicious PDF — malware analysis report

Static analysis result for SHA-256 af738c3a8262d1c2…

MALICIOUS

PDF

87.8 KB Created: 2021-09-15 17:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07fe9ef61828ebf3846a345314b5e488 SHA-1: 14f34a209a1da927354a78e3c26baccd74e13ab8 SHA-256: af738c3a8262d1c279f34f07a7845c1aac4d10abc0f58b8108a63eba5f875548
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is classified as malicious by ML and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple links to external sites, some of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The heuristics indicate it's designed to harvest credentials or abuse multi-factor authentication, consistent with business-email-compromise tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://smidgel.ru/uplcv?utm_term=minecraft+windows+10+free+account+generator PDF link annotation
    • http://danangsculpture.com/uploads/image/files/lakebisov.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/57493773018.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35826113489.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b69ef21---21811482021.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/32700366622.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nuxanarejanebudanoxeke.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/72116437564.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/runoruwaxa.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofofuvezajiwip.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/kojupe.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/menutemukexikopo.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/86387823364.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/19638487549.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/2169279114.pdfIn PDF document text
    • https://gilbertems.com/videos/file/622894745.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tafunujetikebovev.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141adef1515f---foxumowuxu.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/vopizugudux.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/xatukasawevaxako.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/41657177701.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f1ec4e63475aca5384781129c1d58437/ripodojapov.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613102f953da5---94740834943.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/46283981327.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 19124 bytes
SHA-256: 2fd1d77b540e4c1e00e09bf00724ce1570793856ec736342ab1c5f4f0b79da1e
font_02_sfnt_off00013803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 10956 bytes
SHA-256: 74196dddb1835543e962b9655514f4a6cfc76c8bf3bbbf61320db76dc20d9e48

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