Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01aa2a8636580eb…

MALICIOUS

PDF

102.8 KB Created: 2021-08-04 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24743f5e6f914ab58fce2eb4b438c663 SHA-1: 2b5fec9b7b03ee653e7b3f05bdf8a831ba80a6f5 SHA-256: f01aa2a8636580eb14a5d303bedd6f0ac172c72627c51edd440c4cb07f43d404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=diferencias+transistor+npn+y+pnp PDF link annotation
    • http://facyt.com.ar/ckfinder/userfiles/files/12324531351.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/dujujado.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/714c0b87317726258b36f704f4a056af/65100220018.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831f6d3aad8---wisegumopujawepapamuliti.pdfIn PDF document text
    • http://chieucoingason.vn/files/15956488524.pdfIn PDF document text
    • https://curvy.tw/upload/files/lakirikojozasuxagom.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ce04b55aa36e888402894ea698ceee5a/nelakej.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/lojuxixib.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/9a039661516ead90029372fc2692131d/71659213903.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/58408672609.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/39609732327.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a43d817281c7e33bd5071dddaabdbdea/tetalebebemami.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/97607355221.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/87b9993a9f4f14e3a9d0f7be7e485587/xilosal.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pbhbcjn4uafb21lv84on22t8d7/jijomen.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/kutosozanibaxikuji.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kipinogiseledus.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607443cf9d99f---butalovojesebiseped.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de586bc5bf---81584029917.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e1ca982ddcdd291000949dbf84d05b48/rulukaxepodotatogivitewi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/21345d7452f8d74b08eb8f945687b698/merexajemazimugi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01b37b0eb---64958994986.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fupemarewixomolukanafub.pdfIn PDF document text
    • http://rld-carbon.ru/file/kamabinifu.pdfIn 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://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_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 19964 bytes
SHA-256: ac03d53dd4099d835c786a66ecb2e7194a1ce36e7b75096a9b355373d594ddac
font_02_sfnt_off000173fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FB 10540 bytes
SHA-256: 416b2ae8d67f6af5a5907752e3522224a2a484a2918d71838edfdcd0d1704ed8

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