Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84931783c96798d…

MALICIOUS

PDF

92.7 KB Created: 2021-07-20 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7e34875107fc2b50dcfd8f03a891ef1 SHA-1: 53a5267530459409378b8c152b5218d98ca0d1da SHA-256: a84931783c96798da13d3eec3d7ebc8fa203211b9ec45b7143bd30cfb99451ff
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content or facilitate SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://accessiblevehicleservices.com/userfiles/file/tozovejizataxud.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd2132fef---58041977798.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e4fee10fd7acafd4f08ea7cb4c718af6/3161010582.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/pajapidosi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/bivuvigateten.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/95439123722.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210618012334_sgxh2a.pdfIn PDF document text
    • https://laps.pl/userfiles/file/zadubaxok.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/80438935726.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608743b70b1ac---sixas.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/vezasamoxo.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/375k804eokt7c8ddhldb9os35b/65126414644.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609daee18064f---84808451249.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/16581567301.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/98599198853.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0ac7d95adfd7da9660dbb7c0e0b6de2a/25171795032.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/15174758234.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b58c89fe6---78739936242.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c95a019b8---tiporojuduj.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf4882caa---11283438799.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/11632107287.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/paxidov.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/04a2e080146b79adf1d2584dd0b6739e/tenixanukagufe.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/nibuxuvufofoweleje.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9sooeiv6djp7152t2js0uvq6j1/ketavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=indian+beauty+parlour+near+mePDF 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_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 10688 bytes
SHA-256: 1a6f6441f8737e830e297dfaff64ddb406f4d56ff832686e13f78730a0702247
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 17176 bytes
SHA-256: a69113b4079b1a6acff1d641badb100430ea2b2e4eac1b475e15189d0f36f5ad

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