Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37939c4c1534930…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af4bb11fd4f6a7096ce293469105de1c SHA-1: 5b7d9f7d6c7359db701c116138dddea29ff46cf9 SHA-256: c37939c4c15349305f1e87d9490384e0ce47bd0d8152c1fe39e05b52c2e1fa79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=4th+and+5th+metacarpal+fracture PDF link annotation
    • http://darstin.com/userfiles/files/24047456848.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/midudoletinasosake.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/riwopitajusovodukeloz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8f9c06802---34307302025.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1nkdo369nlp6lbol291pmtgs7g/pazamimu.pdfIn PDF document text
    • https://domilot.com/uploader/files/99541349394.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210730_950A63D312E2FF02.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/brrfhmra5vmsjkad26s8as6e9l/neridudutaxuwu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/aaeca95cb4d040e164038b07034ba8ec/25901370581.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/94568095864.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/nisokomugegagewadip.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/40a4c8e5c1a3b836acb7ea87495a8938/zamala.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db70d670545---mumat.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a96521d265f---lujusidijivujafobukusosi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kuzad.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/mofafovavepavalemar.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/sixokasozuzogirerasenuje.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/rufopaxezazex.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b98839e1cf0a8df92c2b7f86b0c9126e/vopofejija.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/62051916927.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdcdbd562---1254387093.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f115596f921d36333d8414ac94fd6e1f/tivokavoxajarusoxizewupab.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/i9g0cucn2ovbf6r1t9rnpk51ob/33473297238.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 17740 bytes
SHA-256: dfad7ea840fe8fcfb67635a6458d7a1a445cbf70eec163a75a22f9d4b2f5c50f
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10720 bytes
SHA-256: c1e84c194bd07112fda47ef7df70a0b4f85e57695063535390c56789b13c6c01
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1