Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bdef2d620ca5ef…

MALICIOUS

PDF

139.1 KB Created: 2021-06-10 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 414212f9feb54b7aff525ccefda5db69 SHA-1: cc7d35a9923825008b1451c424edcb31dee86fbe SHA-256: 10bdef2d620ca5ef938120f5da2d71506a86a3f24911b2d6b57711175ef33dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of external links and the high confidence verdict point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=porifera+classification+pdf PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ftn9cgh9lbut44p5o7668k0os7/lumisuditiwaxominode.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedf1a922c---34782247876.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6da7cbc6dd34782a1cafc931a673fe77/77503472060.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5ece0017acdd1c0fe78f2099d671c366/76177865287.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096269acb165---sufizadudarulanod.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/watixikamirunezozifo.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/14394568936.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777e6a54af3---fetalulosopirek.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a7906d52780f6abbb3390a103caec7be/malonalunobovemat.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lh94o80cuv1edgva2p32koj2s0/jojopusefafuzeramopisu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/62411310919.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/86fa1226e40612729794946c98b81462/55546830736.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/divudata.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/42f38e962a147447e60cdfd080601701/7320034234.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/96877457080.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/a7ki93lj5ar2o15nin7olf7ljv/susezegifosolos.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/a23a3469156ce2f9b5e5d9c7eb3c210d/mafox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6ED 5152 bytes
SHA-256: 5c5455b382c12bc6992a85e2dae044a25952c3241f9715fa23fdba315af4f3e2
font_01_sfnt_off0001f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F880 11780 bytes
SHA-256: 8e81395c9e2f764c51f93ff82198a0f9df1f08de98b9d5676488d7abdec9b66e