Malicious PDF — malware analysis report

Static analysis result for SHA-256 e668bf7f47c94a2e…

MALICIOUS

PDF

75.2 KB Created: 2021-06-12 07:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f962ab879a1787cb19c3d7d67d958fb4 SHA-1: 65f3de9db583ed44ce2024456599194bbebcf762 SHA-256: e668bf7f47c94a2ea12867605e36cf81d9c2dec224510b11a7bdab5a53395fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=the+gracie+diet+pdf PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/94b03e540d2376f186c5be7b65074140/rivarimorepokorid.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe912f8f938a2972c30378e7b66670c7/bodewutesumebedetonafub.pdfIn PDF document text
    • http://sun-eko.eu/files/file/83827151505.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s58o3duo3fui4tuo1ik0ia4i27/81278503363.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210524013559.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/nu829dnau5sniih88l4lg01dgh/50179417999.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/77713242458.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22401019585.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed45c5f2e---lipezewuwuges.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/18855140849.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621103349.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/20082345234.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0b1796b6---9175191687.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/20f254c432528c91dfa056063d894b81/12100975024.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071782025f95---43416272984.pdfIn PDF document text
    • http://asfalon.com/__files/file/gokokidilimagutaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5156 bytes
SHA-256: 898859b2c1b523f77c3b385755451ec3a5202f85c449f475afa0fa1363126504
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10868 bytes
SHA-256: 38da29e6c4bb6425bc33ec8bcc790322c0fe04f3b09e294d335d79c1138722e0

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