Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc412989857642d1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 11:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08f42645b3f1551acfa8f4d0c7eef24c SHA-1: 9e917acc0efbe05d49e5f61a2eb91873569100f7 SHA-256: cc412989857642d1f84c394ed70bf42f5f07496880299c2d53d68f9582178e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a potential distribution or hosting mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jafidarunavokaj.pdf In PDF document text
    • http://scro.ru/pic/file/xixobiki.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/tikekirujopizuru.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/varegowogudakixup.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kaxerosefa.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/fimikeditevopobefuwoko.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/35218701971.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/40014383301.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/zojisuxulufolebogomijuje.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31c1d6e62---54612483280.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b5ced8b4a---4191592236.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/fodadakero.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079427ce504a---sikasimisimokafukaxitulo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1286e934---38358499349.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/kujejofavuliwawovekej.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8221ebd9---14185318960.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25289444697.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6h3etg7lv9q36pqf3ctihtie3u/45531368577.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/91174850698.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/902cc3ce5386843ebb97bae38e44bb26/lenexipu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/42937208507.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/32827356835.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61322bff2---11971891807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=radionice+za+roditelje+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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 10680 bytes
SHA-256: 30490c9a72459cdc999adcace5b94dd0d6fbd05dc40e9f5157e33ea644afbf45
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 20476 bytes
SHA-256: 60b2558f4136474bc617081beafe9a5a992fd94c9a4960d01c63893d0e01563a

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