Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9df03351238971…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 23:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b925cdee9afed8fd3a3c557522f6342f SHA-1: 278095e255ed24ccd845918872f2de2f1b681f3a SHA-256: 3b9df033512389714eb1df858e38cb9c2b97a57dc61e164fbd166d1402cedc91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment, designed to redirect users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://network-italia.it/file/sakanubofelegeravovoj.pdf In PDF document text
    • https://renesens21.com/ressources/upload/files/82960712697.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/23292852831.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/pezuzu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/556aeb86c6165d9286e3e4d9a969ee9a/53089173072.pdfIn PDF document text
    • http://atrsara.ir/resource/files/94993286251.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tibolawepivetameju.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/58497612445.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fe56aab4550a2be527359b6568755b69/7731054953.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/eaaad1f8cb00494e34fc02b99f3448bb/56706234544.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c309220b52---xapetewapizaz.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/31932368484.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wafavemebotetofavape.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/20890128353.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/22812742814.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/30ad8e907e7fbf476ece70cf23269c71/binebusomuj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ded46fc49---68645687026.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/61557816155.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e0vepljbu8rd3khkb0hjm702hh/92654892865.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f716c99c709---95890342068.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/57733694760.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad08d2cc6---6311262587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sickle+cell+anaemia+is+related+toPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16680 bytes
SHA-256: 890bee1b52a80c074e1aa3e0d07d6da731814aeaddf1afd76d1e371b3caa3ec8
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10700 bytes
SHA-256: a88f8a172b4a0f69fc5079b8d38218eae47ec34cb1b3d85d47c36630588c6414

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