Malicious PDF — malware analysis report

Static analysis result for SHA-256 126063b18d69d628…

MALICIOUS

PDF

79.6 KB Created: 2021-06-13 05:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0244d605109588b7d66c4e7cfcffcbfc SHA-1: 6be147e3b5dfadf2e60c2258c8803daab0af8ef5 SHA-256: 126063b18d69d628ad3d769a8ab81a009c01f6d3076bc28649fe2a149bbfe802
156 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, likely intended to redirect users to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing and trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure.

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://infrive.ru/uplcv?utm_term=milk+and+choco+mod+apk PDF link annotation
    • https://arrayamed.com/userfiles/file/dokagefobomur.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/silg36eb75m01i1pm39vi0k570/rivuwozeri.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5k4ta2tvrlgs25l56n5emjnok1/13674662828.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/xiwuzu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hsqnarsso1ekeb9vvsn1dknlge/13290147823.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160740bda9233b---3083638230.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqnokr397cppj47sp5nmjeo375/74120939675.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0690f75d---59241497519.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file/%5C/94910912399.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cd1b0cb123bd9046bdbd1868ab8323c1/lezobofulusamowes.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/puzawufonubapomi.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xaduludavuxeporujosabimew.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c28347fc549b7406a88583dd39eb4cae/43879960493.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ee7cc814561ba9df66a0caa9f110ea47/kaxafodaxopisukunivisi.pdfIn PDF document text
    • http://sy-tech.eu/file/rakazemoxewovorad.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160873784cf3bf---rofifodututejor.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b22227fa---75068603256.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_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 5108 bytes
SHA-256: eb1f1eda9dad6f9bd4122a169cabd9704d6f4a298976d2888639fe0bbf2250c1
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 11112 bytes
SHA-256: 1ac0a14780615eca96f6e276e9758796dce1fdd99803f5aa5a49f9bc8d43f68e