Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e42ef9e5e43b40c…

MALICIOUS

PDF

76.5 KB Created: 2021-06-21 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c1b9e6c47cf8883db755a63e266e02c SHA-1: 0e0c2abb8bf1558209278672a991fabd8b4f5d4c SHA-256: 4e42ef9e5e43b40c70625a2fc80df24566200fffa2ab5a029d8ce9dfbcff021f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm designed for SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2458a7e74---86957061889.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8588c360d26f0ab2f8ecd050231c1d16/vekenif.pdfIn PDF document text
    • http://moristas.com/userfiles/files/2665803368.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990c4fbbd25---jisijovusiviv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7849e5715178e44932e265f961cfe1b5/16632047571.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a01975a00---70852800496.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284abb7ab4---lalukododedove.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/ziruposubofawodelamexefo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807809ea79a---pogaxegalutawefegul.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b936b19a---36864514765.pdfPDF link annotation
    • https://rubin2000-distribuitorshop.ro/userfiles/file/27336094929.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/niparevitufulaxiwosetitap.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817a67d18be---4050295125.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e3893p9n7r44po83vhsn246uqk/pulavawo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa72d86ce---30396930445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+lightroom+6+serial+number+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 5604 bytes
SHA-256: b41ca595872f5067cebdec5e28b03817953d298f73463d9cfee4803c228d321f
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10872 bytes
SHA-256: 09e1374e779049dfc14f7a265f8ca3401ed1c65998d54c5de523c6d5c30916a7

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