Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcdd89b2785894b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-23 01:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73364719812db3e486007ee60a9717eb SHA-1: 931c25c4c07ee094e8b99c05bf752b1ef2072479 SHA-256: 4bcdd89b2785894b2d0214ab073470b2a639302525e7528f5459d1ff24d6aa41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress sites, which in turn host other PDFs. This suggests a multi-stage attack, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links and the compromised hosting infrastructure are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f566e3dd---42939096089.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xenotozidogefoj.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46a6e51579fc835116f1bed28b2c7040/976364060.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/24014028662.pdf
    • http://aite-materials.com/upfiles/file/janudenusesuxeti.pdf
    • http://dlikefulproductions.com/clients/875850/File/rigekadodazuwilexopadafu.pdf
    • http://vodnik48.ru/content/file/vexaruju.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ecf1752bf945588844874992a078fde0/masemekusezowakulinisure.pdf
    • https://gamaconsultores.cl/upload/file/wilonezukopelovasivug.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qtf3b7jrt1ku29b1um5luc9hhs/zuzuxela.pdf
    • http://keramann.ru/uploads/files/gurotojetixogulu.pdf
    • http://vtvxm.vn/userfiles/file/16740870533.pdf
    • http://csc-028.com/userfiles/file/20210612005519_2jygyy.pdf
    • https://cristalensi.com/public/File/15928842402.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/zedivarukoto.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e27e629015---lujipijavimej.pdf
    • https://tonwen.org/userfiles/file/radoguga.pdf
    • http://karpatskiles.ru/store/files/dizotepesok.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b4b96bb6f0e757bba96af7509f143ff/sevejakotatugilagezik.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4985fb6e72---derodojubowixukesi.pdf
    • http://brandiassociati.it/userfiles/file/85268559165.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/01d4c251f793cfbd893a4651fefe669c/zanekugixuzepulofuro.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66ccebe67e---97216160475.pdf
    • http://abwingsva.com/uploads/files/suloborebirekopudi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=export+ae+to+premiere+pro
    • 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_off0000ee51.bin
9f781496c0dad687c5abd2a18c8d1126fe1cca29ab7defe698d095930875a479
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10180 bytes
font_01_sfnt_off0001051f.bin
5c16c5cf4b81a1c828a3add44e49672d4492676f787b87e9de712d7cc9bfa106
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 17808 bytes
font_02_sfnt_off000133dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes