Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205ad81d79f50ec…

MALICIOUS

PDF

91.7 KB Created: 2021-09-02 10:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 90ed55ab067605b38d42fccd319354ad SHA-1: a2a646010a666392dc0bc32fc0d63e31aeeec447 SHA-256: 3205ad81d79f50ec9b21fa1e19fd3232e2cddc97e1f76e9e1bc8fc55d7be10ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic suggests the document's content is intended to trick users into clicking these links, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://manavpublicschool.org/manav/userfiles/file/83231032490.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83015600726.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/98199424480.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zenawejijol.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/robejorulagemuwax.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8ee511bb---fedawuvese.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/teberexosutinulimegufego.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/papafewuxedeluxitatili.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/71915930712.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jobowokorejukenubebubopi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301733002133.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qtb1fet8lvtt63n9gu51m0bhq0/falen.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/046d682a838bc35646c7116fb33d1451/53298437754.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/98095653578.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/82574515068.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8ef16e6534a986efd893338427ff5154/mugifotefuberu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sh2q19csj8m699g2q4s0p52326/51165322383.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc7966121---bokuzezizodiligusuzewenej.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2c9bc8ddeff00000b84ae05f6576b72e/zifizaxobofonatupewufivib.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963b3bc317d---55249440004.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/21295195963.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4f9d44a7---bedosivuru.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/48595f7855a745d4bb8542dfd2e65ff0/gukudubifatiledekatejoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+unclaimed+property+taxablePDF 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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 11084 bytes
SHA-256: 863cecd2c8fbbf7fe2623d478eb78361c0514eb3eb0977734602dc8e81972698
font_01_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 19120 bytes
SHA-256: 9dd08babda7bdbe9eaa5e4b34472fc7fde86b28ee28fd962b4bec5d8809d15be
font_02_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1