Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a29a86d2af59093…

MALICIOUS

PDF

101.0 KB Created: 2021-07-14 00:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3262ba4452133216a2e3429b0f08906 SHA-1: ccd90f117ebc9de165d765a6d486b7e7cf0040ad SHA-256: 3a29a86d2af590933e69018b6ab73e060a81d0b6b7a07665b4e4b0034f811333
164 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive lure, such as a fake invoice, to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/larebifegijexi.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5010018cc43c219fca7f242ff6ce134d/66107359704.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f6eb20c067d884e78c2c1c7b64610b40/rewuzofat.pdf
    • http://billsky.ee/files/file/goxarosoxusogup.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/524aa2d97bf898deb34f55f1ae4913bc/68609190942.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/972b7a9682580321169e12295203ebd7/zigafefogovikoderi.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160815b1942b8a---raxobulis.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lizofojosopudapodej.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/412b1d064019e15a1a13de53865fa710/vudixodubevax.pdf
    • http://atol-res.pl/uploads/file/1515243667.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d211cec55096c24b555470a479c4f399/bupoxipizedamibebev.pdf
    • https://himalayanthailand.com/image/upload/File/63457215549.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ulc3k004uip6e43ip1u6brlla9/kukokafexubeves.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a622deeedbb---xapafoduz.pdf
    • http://aire-limpio.com/img/editor/file/dimesarajudinunun.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f15d129b---nikamet.pdf
    • http://staresecurity.com/userfiles/file/vitulavororarulirup.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vce2btp0cfjel0g3h9p22tn92o/zifaxagaguwapebelewezub.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rqv4q08r9qfdeulqtcoevclbvb/zemoroxepepakisuve.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6c9ba2936a38884a5c100e2e603d96f7/zuzolikux.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b7b5a478---66607016967.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5156d7b7319811bc70dd00c9c65949b4/girepitu.pdf
    • http://cmrivestimenti.com/userfiles/files/figugenijig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=journal+ledger+trial+balance+balance+sheet+solved+examples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126a0.bin
8ed234f4717a0c51ba6b78ff4393f5f378411aed5a9d5af25f764e9755a76e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 17412 bytes
font_01_sfnt_off00015425.bin
ada771fb760611fadb838ffab9e3a043ad268f9acaa8f184ad334218cf46600c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15425 11360 bytes
font_02_sfnt_off00016e4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4F 16792 bytes

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