Malicious PDF — malware analysis report

Static analysis result for SHA-256 d476a9fc591b5b0d…

MALICIOUS

PDF

71.5 KB Created: 2021-06-08 10:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e19edd7481313321080b176185081834 SHA-1: 1890bdc6c64f9c606631bf71d9d355d179544948 SHA-256: d476a9fc591b5b0d7a32800f5154893b827b41eb8c2923a9c648488bce3aa292
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though obfuscated, contains a URL that appears to be a lure for users seeking information on programming a TV remote, likely to mask the true malicious purpose.

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://drafthe.ru/uplcv?utm_term=como+programar+un+control+rca+para+tv
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073d82396a82---xelesimeburatinepo.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18b01dc45---dijusasofomevadoz.pdf
    • http://tecsun-moscow.ru/docs/file/44378312244.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f6ad913fd5ddca2bf00fdcac16c757f5/wirujefizamup.pdf
    • https://alexandrapanayotou.com/web/images/static/file/61075497172.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mcmidhk0fvhmab7nlbnq1722dt/zajijilutozumob.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9es08h86na733ijs51ul09pl7/82655445581.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16081dda106989---81716989354.pdf
    • http://apsara.ru/userfiles/file/foragupajop.pdf
    • http://bjallstar.com/upload/file/49404196828.pdf
    • https://ktmcollege.org/public_html/userfiles/file/12271605845.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qoeqdk6654hqp59ba0tqvqais1/76061544311.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cab37901c---50387611086.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833597af788---60836696518.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb273d7eab---25752881401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da62.bin
fb0a9d1b04d734ce36c39ba43a4525d08eb556ffb7c82c3f52034d47c47de627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 5040 bytes
font_01_sfnt_off0000eb76.bin
fa9a5d52a38fede90dd37d0daf519b64d75a81d7cf619f4109135d947660a109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 11420 bytes

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