Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57cfd2d4682ebb4…

MALICIOUS

PDF

98.5 KB Created: 2021-08-02 12:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e082f59f9b18cee87c400e449744e34f SHA-1: 76b1deb742181d65a8c3dc2742b2998899697211 SHA-256: d57cfd2d4682ebb4817eb86b34b6dec7d7b676e6d7adb3c2aef1b3c5018e3216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://campfirewtx.org/userfiles/file/30723749002.pdf In PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/lunubalitodul.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/duqgjtho2da808u0dek4lld3jo/37082574430.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0vfcge4cd7mtg5bfp61c026q0d/58974095682.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/xipuzupubefagurejibenenu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1ougdtintcc55edhgailnmln10/kibizibikarafubivexonugu.pdfIn PDF document text
    • http://healthywithhart.com/res/file/43774409420.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/20322416047.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/vifixogegiziribiweko.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5aiepcnfblf859jufnqoj4lvjv/salorerijuminelekalugan.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210701_B16E24C4F0A41F65.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb98a35e140---7837733864.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/e7eplnb5ibqh84nbfscekn95d0/samajegodavuwulusisasa.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/23867252898.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/kaluxovovutefa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/07c3899c6fc3fe019444ba9e30de9351/wafuzamiduwijatar.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210619_1F97CBEE8361EF19.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/91111866372.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be4a2d6f28131daab1c9d9bfe8da7b8e/5680703628.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee80afd036f---vibitizodovanarozadobe.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/50490510542.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35db105b21---vefijopazukojazabireli.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/kemorawivojixowadip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=areas+y+perimetros+de+figuras+geometricas+ejercicios+resueltos+pdfPDF 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_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 19324 bytes
SHA-256: 3cac1edc976da69e044226cbe07f0ac2966f451a37d233cbcc0c14f87fb332f0
font_01_sfnt_off00014791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA8 11184 bytes
SHA-256: 2efff964a6aceee611a4f7a241968e9864ddd85713b3a9a2338a9c3b1e1d9354

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