Malicious PDF — malware analysis report

Static analysis result for SHA-256 43caeaf036b8d354…

MALICIOUS

PDF

88.5 KB Created: 2021-07-24 01:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06ecb3ebc9970bacaf8308d1fe5e4ad0 SHA-1: ebeda521691266bc169eb638f439202fe15f1411 SHA-256: 43caeaf036b8d3542a05e58574d329ce2f6aa44718fdcfc8a18ae165543b33dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous links pointing to PDFs hosted on compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca8bafd67---divenololugimanalowaxes.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/271123b0f88a1755abec513bf385ffb3/51775766354.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/rigin.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/30999006496.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224496ee51---30571116460.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/87009233092.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/30172602970.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/de367bca60274406267e9706cdc5bcf3/tekasifeluduxinu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095797525c18---3855047892.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7ed6d78a---pekizidagugibureloja.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/resuvidi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/89209495684.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zubofe.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/41703433843.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ff224558---69014598206.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f9a5fb7a---gadavenovokebiwide.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nonopugiguvujitexaw.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/9981379799.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rt0q2t3gththdm41set4jjn316/12278268049.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sofadamukogakoparepoboku.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dijuvipizodil.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/j4h6rbdela9d5etvqn6kovsib5/govimumipimetuwikuwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mario+kart+tour+characters+listPDF 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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10408 bytes
SHA-256: f798dd464bbfd99b65653901cbf996ee27f8ef5612dd2043dfc636543a0f4eb2
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 17216 bytes
SHA-256: b6746a1cccbdf363a68d29a02b2279d3261e5a3b3d0611961f013dde337eb526

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