Malicious PDF — malware analysis report

Static analysis result for SHA-256 72acab2dc54d9378…

MALICIOUS

PDF

96.0 KB Created: 2021-06-11 12:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 48eba1ba0258c7fed8ef1babf70b64b9 SHA-1: b16e93ac93c979c8836eb19b4a6a9ebd0d3e19e6 SHA-256: 72acab2dc54d93786360ac64095076e2d2937207ed1e1d6f1a51e2c3d198ec9c
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content or facilitate phishing.

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://nomylo.ru/uplcv?utm_term=english+textbook+intermediate+1st+year PDF link annotation
    • https://bilalyapidekorasyon.com/userfiles/file/30969827262.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7mll7ou88nfrj83a7c1j9h1u4/39450699789.pdfIn PDF document text
    • https://airshow-bg.com/file/majapenafinufijezede.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a623d6016ba---nofisoniramudevorasile.pdfIn PDF document text
    • http://www.toptehnik.si/images/72852706513.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210528053020.pdfIn PDF document text
    • https://aashianarealty.com/file/70235289863.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ccf5eb5a144f6c1866cd8e264264ab7/7737986566.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/987503b281338e8f3869ad6d324ef45d/38598083141.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/377c653b12d41fc73814745a12b6bd5c/vaxenuw.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/73442957020.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1802ca2673---nonodoveju.pdfIn PDF document text
    • http://carszana.com/image/upload/File/teranoluwegawumer.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085489e57ac8---kolerinanebadokivo.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/xefesuwukolevev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 5620 bytes
SHA-256: c241bbca2468b3003ab5fb01174b7ba60ff5a038f62ad35d25a63fd476188eab
font_01_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 9536 bytes
SHA-256: 4281bd430d6cacbac9b6f6d6497a275d1e76a51c1b01c5fa16e33bd04f2b1544
font_02_sfnt_off00014c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 11356 bytes
SHA-256: 47e7189e18c5bf1e679053b64a40909a47c12ca6c70640b2ce4a049a8d92eacf

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