Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93d56b253e9c26…

MALICIOUS

PDF

94.6 KB Created: 2021-07-26 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03c9d57691742244e0154072571adc92 SHA-1: a61bdbca846ac87b4e2182bdf9dca8b656a1d977 SHA-256: 6b93d56b253e9c26c7bd775bb519ae9b1d08b26cf71eed20ce347387e840b186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomorecpapmachine.com/userfiles/files/zuvomotibujapiwa.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/53c78235fa6df9f58a339c6764f5813d/32868705439.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50b8b58f01---3332689216.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/bagujomezijuvawusolawir.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783bb78795b---tidunomugusuv.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fofiga.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/29057777359.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac7946fc7---91347330168.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/42145142722.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kafuzosidogiberulese.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m0bdn5c0tlm2aqnn13hdj1goof/84906686335.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9fb46fc389372b7a1fbd233977e4e2a4/zasowezilo.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210714_8EF9608DE152269E.pdfIn PDF document text
    • https://signika.pl/Upload/file/nolonumupividepowej.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9v91cb88f0s74rpau7buf58vl/63202439105.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/70863818441.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/fg0iuugngi1bi8j7cihuve7se2/zegebamiguteri.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16236315759614.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e33eb0dce---40321761422.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dblicgsre2e2qqafervqjot9jo/96000689950.pdfIn PDF document text
    • http://geasit.it/userfiles/files/229168476.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/vanovukagogemetup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+activated+copper+in+no+man%27s+skyPDF 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_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 11012 bytes
SHA-256: b6f37ea9a816fdd4b97173f603f5b59324bb5b6f91ae29d611ec86ef8df76d30
font_01_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 17184 bytes
SHA-256: 7afbf34883b76aaa61c5d27f0f7e62e5343fc210c1c5ffcfb20e20889c093b4c
font_02_sfnt_off00015323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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