Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cde1dd5295ed4c…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 17:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cc635ff61dcff010f1435beb9e31a4c SHA-1: 58d8847cdc77359f2c9f31f4a4d6fafde016975e SHA-256: c1cde1dd5295ed4cdbb08976715a2d83308707530e38dffb267c65d362b47d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72fb83b7e57dea9f0ffd4001e936121e/24091862758.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93c93f4be---64579509498.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f1a736733---99429669655.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7e070fc707ca15e867aaa723601059bd/dawofividepopif.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcecaec32b---zagexomumirapipen.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u86med98pblo7bqj2p0acegu5b/matokig.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/65868592027.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05ae9b2ebb7654a68f75c0def6a0c212/nupajasiledalimegojob.pdf
    • http://dzbnf.com/upload/file///novesegijuvivimifulud.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb65eedda27---nugitexifemisawav.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cc220510---57227435741.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e1a0c6738ff7280bc6fb007321d8c2a6/lupukivaxasunexuboxuwaf.pdf
    • https://ideylia.fr/uploads/file/53232639652.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43bcf2ce9---68718658774.pdf
    • http://nwatchonline.net/userfiles/file/86564989753.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dc8504505---rodos.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8700213587---61310514708.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mtaebr2qhhnavcp86iknqt6h82/67365802887.pdf
    • http://www.ecvbrass.ch/user/web/file/80852938158.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996524e46fd---lizigulijetadogas.pdf
    • http://christschoolblr.in/userfiles/file/wiwere.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=better+to+be+a+witty+fool+than
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/10a300a7699549c6c8a35f2680829863/72708802876.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_off0000cd04.bin
9ff716d6ffdbc31bffb8cb5400c1a6cafaaac1b0698fd445afa35783d55aaac9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 17076 bytes
font_01_sfnt_off0000f95d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
font_02_sfnt_off00011174.bin
0c8420c367065469b859995c03810f9267bc5077831d5a14d1720c00e9a652ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 10536 bytes