Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9481775d507674d…

MALICIOUS

PDF

99.9 KB Created: 2021-07-24 22:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2ed02983498dfcfcbf8ab22ae9ebd41 SHA-1: d64419b6c19053c5212d45b19327f5c079379b08 SHA-256: d9481775d507674da5ddc0c91fc08c16269ea8171223dbff75d48c34d40bd13c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://al-bandak.com/userfiles/file/13262216265.pdf In PDF document text
    • http://casier-a-bouteilles.fr/file/18344842558.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/piwuripazafige.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/10241313882.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895c71416bb---vidigag.pdfIn PDF document text
    • http://strap.sk/uploads/files/pukop.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5bb7a10e---rojaxa.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/48882359768.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0a149f89672fd719ed36a39873bfaac0/monuvipunupirexo.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/regedodejetunof.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wozijuwi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/q0a6r2o4f0lgdlo055u9nqqlk2/25128270710.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jabot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6c921d54---wolemimugerinukanowodur.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4efb755e9---81687927695.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2dd7b2c9---25099954306.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/88803331747.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/47536651953.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/21af81900bbdd3b04b053d541c93ec90/83988694627.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/29871715084.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/tebadodolivolumada.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pidthf3no2ln4vabrecsjk7fs6/jixivojakaduj.pdfIn PDF document text
    • http://billsky.ee/files/file/97494219758.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/o2e5t4llpt4pvncbhec089bfp6/pomelesakupimumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=textron+aviation+beechcraft+king+air+350i+manualPDF 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_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 17192 bytes
SHA-256: fc71b0f2d5c1e6440b35300d08ee6ee2c89a891037929ce59ea42e658da7f67a
font_01_sfnt_off00014ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16502 11508 bytes
SHA-256: cdd0273764d745f8a4bde99caefd47ec18db94ee0b49de0b0b288c85b422e78b

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