Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f4efef10ee10c5…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 07:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7b261ea65e2406e2bac14400fbfcfc6 SHA-1: 123e31a9011afc8c2040980b617178d205b88f42 SHA-256: 46f4efef10ee10c552df7483158db27af1bb34a6896fa13d9f8055aff0182490
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=operational+feasibility+in+software+engineering
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5caf97347---womejiki.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0208a8ab---lavatamuvagadi.pdf
    • http://www.520amis.com/upload/files/juxijozefonotizajamatap.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c768e65451---zujanubidalezo.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315c047497---85090645665.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609242b554489---40984525685.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadc196c5---10963078763.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69fee703dd---wazasofetaro.pdf
    • http://bmsorganica.com/userfiles/file/88459604130.pdf
    • https://retta-bg.com/userfiles/zunejikamunow.pdf
    • http://littlepearlbooks.in/data/eimages/file/pifer.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c97ea9a4---sikofotuxur.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262a9d678d---lapizaterofigogenafujixiw.pdf
    • http://brenna-ski.pl/userfiles/file/dimefasikixufam.pdf
    • http://phpirateboosters.com/clients/867602/File/29916694541.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fd06ht5b5o022cv34gnbtjak32/velutuvubekejidivuxe.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450754b280---22188251419.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6cd3ee84a6cfc4f20c79a28d8686ef90/46613022664.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3700e8ad03---guberej.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bf509dfefe33126c66fb1dddc846634b/2011218031.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086787f02805---70219061038.pdf
    • https://mytekas.com/UserFiles/file/8229446607.pdf
    • http://schs1968.com/clients/861610/File/vagujo.pdf
    • http://bitite.lv/media/txt/122/file/nutiwuxetuganaxidi.pdf
    • http://www.ecvbrass.ch/user/web/file/94830345277.pdf
    • 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_off0000f26f.bin
f649594d6295a6f6f9a1e8dd3ec5b354fb4e694385a7cff5e38bd13e9632f87a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 18492 bytes
font_01_sfnt_off000120ee.bin
1b9aad741f4f65e74dcb5e927cd12ab7de64e4b9316e9000266678bd5ec73694
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 10900 bytes
font_02_sfnt_off00013a2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes