Malicious PDF — malware analysis report

Static analysis result for SHA-256 4937a5109b0a35f8…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 09:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d2b7a2f830e32baf0b792cbdcb925a1 SHA-1: 6103570bec0e5ca69eebb31cdc9afe43b9df1476 SHA-256: 4937a5109b0a35f8f1580b365e48ddcaf101185df133e8e4ec42d80fe88f497e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. The document body, though obfuscated, combined with the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic, strongly suggests an advance-fee fraud attempt. The numerous extracted URLs are likely part of this lure or a mechanism to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://carrasvilla.es/uploads/files/xopitekirikulatoliruba.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/l98ub10ks2nrvj6t2qgct2g715/9993636387.pdf
    • https://unicon-msk.ru/data/files/1051428323.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6e1ffaf70b291a9daed40b1682d475ab/zitedagomimifalezasi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caa981bfa---rojobigojal.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/52pu6efmnp3g7efv49gumb4h40/48920783694.pdf
    • http://pomocnaukowa.net/Upload/file/55328347164.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb6ee6b17a---wavogusadag.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca2911568---34731562711.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlm6buntuscit9kf3t1on9rleh/kivonovumexuredivosam.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/bagixobaburowiwu.pdf
    • http://color-gateway.com/userfiles/file/60335585005.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hfmpsh9q0q4v7h5lepv71posrl/wuwififurov.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42e03d50ea---dolizesuropazijepiwe.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6ff46c96136ea0f583a3c2c43815366/64057160154.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbb990087---sixusemajosadadodebaxotij.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b627a08ca0---vokilikefasunusowekekun.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bed43c67a---24667319309.pdf
    • http://yokohama-model.com/userfiles/files/94764233038.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/87630e462b253120da0feceb418f57c9/61523116157.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6c6d538c1d7c70c6593aed7b4e4bec5a/69119036219.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec79ab959---gidep.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f2d3c5b150f39b694c69b9a6e2a0d395/25729790172.pdf
    • http://fogathajtohirek.hu/fckfiles/file/nivin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=internal+control+in+auditing+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_off0000ff91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
font_01_sfnt_off000117a3.bin
ad44b866a3e3f89d009b42df0a8fb990f97d8db67a8993775dbba0011864daed
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 17296 bytes
font_02_sfnt_off000144b3.bin
f90bd9eb4c4f24620d2f825b629bf75caad4f4849f2e412ea64e41067452e20a
pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 10676 bytes