Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94e53459f5a961d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 19:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 161d4fc961c95a26434750b70032f830 SHA-1: a6caf13e2cce792c5e763dbb6ff199f1d629be18 SHA-256: b94e53459f5a961df37e2dcbc3d960a9a295bb2e722c16876805003f9d50341c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=gta+4+tamindir+gezginler PDF link annotation
    • https://nguyenthelong.net/userfiles/files/34195877678.pdfIn PDF document text
    • http://schokobrunnen.com/idata/nogonewojikisevaxewelob.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a5h82veps8ic5m2362uocai5n6/romusawo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4e2620060af28bf59df385443b4e6e24/wagezuzuvudedunasamilijuk.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7375fe0826---kivukigotovulu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a246701d70e8739aab24964bd150bec3/433438865.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/16736282815.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/gofivapevezoz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083463c74983---30700200627.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/38958361053.pdfIn PDF document text
    • https://blokhol.com/upload/files/16974984900.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1a69333---60628638313.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/14551570654.pdfIn PDF document text
    • http://www.toptehnik.si/images/kasadatokeguzavam.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6fda6bf57373868bc8f6f4f20379144a/gopefigimereniv.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/fikitomabutukemo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5d978f0c---jexuwi.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/21a495557c9061bd5ab3f4b095a60800/62738349701.pdfIn PDF document text
    • https://buka.ru/sadm_files/vijebogakelugodujipig.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/801c0bc7cc490c9db5fccae8ef6d2c53/todugonizodemopizuguzubo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bbd0bf3caa854852342e279f5c60dc97/1278135943.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/426b98fee7edd184d33ace942c72504f/92053721966.pdfIn PDF document text
    • 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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10480 bytes
SHA-256: 80ebd1e75542952b6ee0a3ac34706b6bd037272d00f449c1b05a9978a1d3823e
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 19688 bytes
SHA-256: 9b618a2756411364bbaadf29c1b955782f615c71f2f41b3096f98f3cea174093
font_02_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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