Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e68940bab804dd…

MALICIOUS

PDF

87.5 KB Created: 2021-08-08 21:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f9fbef9bb4e99712ecb5715c19c693 SHA-1: feed70ab58aef4b6d8ec9e2340cfa3b7992ecd9d SHA-256: d6e68940bab804ddc85b64a6f7ef62b98762a7c9570e6fa9e058c3cb7aca882d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload. The document contains numerous links to PDFs hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=what+is+the+basic+aim+of+psychoanalytic+therapy PDF link annotation
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mapewi.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/30124658711.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/jemuza.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zenenifedine.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7c1ad28e---fokelugikik.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/46baf1f5b7176bc6aa9d23b892c899f6/bajalopelunuzawigirutif.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11c6b722a---64186753962.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/semurunemuliba.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pgk587guguod6h0968acjtjbfa/52863334557.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d7b44826---visoba.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/16720880721.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d767589ccac---jifedewiju.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dde66df0319---bejilijudo.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/segufileke.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/98aac17f4aba98e307c80fdd342ab9e0/tujeniwajol.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/petigepapovonowofox.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/wuboso.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdf676f280---vububibadil.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dee1d4cd17c3bf02b137b66d0321f5f6/fisuzipukevibajikosof.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/39680477202.pdfIn PDF document text
    • https://haidangpc.com/contents/files/69695386581.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979d97ed74e---xaguvaxokinikinazajobitu.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/gofaz.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10992 bytes
SHA-256: dbe19357b9d06c6cf005503dbf082115a6537a8a809e3a98bc820745b61ba6cf
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 15992 bytes
SHA-256: 4cb0449bad19a765ff599df8492aef0cda5ec41cb0ba48541ae8ec2b80e5804d

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