Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b0ca6279753f7d…

MALICIOUS

PDF

100.3 KB Created: 2021-07-31 12:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b1184a79e13d48388be919cf94ec654 SHA-1: 6f6b3320308169397ddb62703cb8f7d02cdd15f6 SHA-256: 01b0ca6279753f7d2ad655e1647e5098168af88797b877a8357b4ddd416d069b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to compromised WordPress sites, a common tactic for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cructi.ru/uplcv?utm_term=how+to+bypass+parking+brake+wire+on+dual+dvd+player PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e2vm5kdq7p7v4p2l8epiqrgd01/jilonatefuzutavezigak.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94d313797---zemopipejorakigema.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/subugenana.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6798ae235f---12592163688.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/37615776169.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tazivamaf.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f7fbca2e---jegavupekijuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858e620a97a---tobojamasokodojugijafel.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/56842240027.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/76456288396.pdfIn PDF document text
    • http://kelvista.lt/images/files/12190971873.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378e860e55---40463022322.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2de29488fa55a1c8fb669f50865ff536/43369014792.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b65b21eb5e888435ff171b07719c08ff/90949205702.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/99762200453.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/60296614624.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/73096559312.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c18274d07---24750597109.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831b2975e---dujafag.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210630105450_273672125.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ac1d3744---80588512376.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/64598825642.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/gafojopaxorafifesevufeliv.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f52be3454d0c1a7800e94dfa6612d05a/fotejamuzatabe.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_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 19412 bytes
SHA-256: 5148d8447fadc105fc25a39b9c32aeaffa24097ede34f9ce3ba66239153e1e02
font_02_sfnt_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 11156 bytes
SHA-256: 687da076d29153bd7d59e7271d592584ee897be3e5cb946d64a3bb44d04c0eec

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