Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04b025ab687bf6d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 22:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e96d8e8593c69f79f1cc5bc1c8d1064b SHA-1: 46f521eaca901d96cc053e207af1da1b6f389e80 SHA-256: e04b025ab687bf6d307dd69125938a963a9c8387d8be1f04d8f6dd0017e38009
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and ClamAV signature. It contains numerous embedded URIs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://archinfo.ru/uploads/file/73727952240.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1d77b0dd---55770262204.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/putizasix.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbac1d2282654014a0a04e2b0d8ab362/52428985211.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zawiv.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xovugasowoli.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/26669789052.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/36142084406.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/83ebec445902200526efeaf0d38ece58/neritawidozunedi.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/biguj.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94950191988.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/vevudabavokekefarumimete.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zubabekizujededud.pdfPDF link annotation
    • https://mirrorlink.com/public/files/files/30701233515.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/30310188243.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/xubudadodilunuf.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/13/file/74292998325.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607000170ab1b---95872355074.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/juwifav.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/medapejikupobiwexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=separate+pdf+small+pdfPDF 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://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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 18076 bytes
SHA-256: 5fb536709554aa81e76f355a29c678abd9244d659aa68cef72944237cc6ed382
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 10416 bytes
SHA-256: e8505d66faa3fdb537e6db583b7bf22fa6ae87dc45678772bde9c4b8900b50ad

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