Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44d3ea68df85d9…

MALICIOUS

PDF

86.2 KB Created: 2021-08-05 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bdfbd587187097369782c2a3f0ad1f1 SHA-1: 26aaeb85fb5855b4bc31ecd18e871b2a769a28b0 SHA-256: 4b44d3ea68df85d9053efbe3c983ddda8c675771641aa5730e8053091e6fe033
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3d3df802---pevatevomidubigudo.pdf In PDF document text
    • http://maybaobidinhdinh.com/upload/files/jetuzijozigevipaw.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090c30cafc91---23117191143.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/68923740740.pdfIn PDF document text
    • https://onlinendttraining.net/files/2012490632.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/93245bb83d6d03a32a963743fab8cc4d/dagaboruvosotozu.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/kematepanubu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/89179991229.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/222b14d5b2932f70ad7be8a688814c6b/84413550282.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1d8892cd---12294637623.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c62b58904---73767609221.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/38741609655.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/6689748934.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/80714760433.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/98684429877.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/69809833400.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/na6ig6nv0qchqvfd8qticalt11/semuladetol.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0cd1900846937e2285c0ef43ddd2634d/34495288568.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/fceb30ffa63f3e39897024649d4e9fb7/82794930593.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/31011953284.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/74463852233.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bea91c7dd4f---44932708644.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/xanok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+lite+cheats+for+androidPDF 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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 17412 bytes
SHA-256: 3a446667b18bd7db0bdd34a102f298212dd2ce34bd0c3c336a8984fb2c3bb766
font_02_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 10996 bytes
SHA-256: ec2b2f492aa09ee5b787ae3b84c84ff1185a4387c59ef09056c595d763b18326

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