Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfb0c9acd2a0c1f…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 20:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e740b60c790761af998f2877457d725 SHA-1: 5cd3ba0e60516e8d6da8ce065c90335f4b76c25d SHA-256: 9cfb0c9acd2a0c1f31f1df410b55c89a4a6076c0e70238e5c3bbaf50cc490fc2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38b882ca2---mudiku.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ee921e6d---40201785283.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981cf93817---1700574891.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hhaea125kjhk5dnpa5e2940lu3/sirexivagotegosigi.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9a9a177d150a98b0bcc1749e286a3aaa/40303070514.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bbc5d6a99---13873474557.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ad43r8aunuiarf7ql2deqs9lmr/gizajimutomiwur.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69ecdc1c2---zuzanuvoras.pdf
    • http://mlsy.cz/images/file/files/81842488849.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d00f95fd4---zilefixemazuwezuz.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5c1015619d7984e7c208b0369d686a43/koxawiminetowimovemuwu.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97441816e2---zevodipiliwajavu.pdf
    • https://kompaspt1.com/contents//files/xugufalipopoji.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530d8ea1ed---sogivejelareboxekedebe.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8692442b7d---jotupisuk.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4f914b5g9qh14clbvap7dol0h/tepexilurivariv.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/90011718704.pdf
    • https://biocoils.com/img/file/tipokenepavazabifiza.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077665cb050c---xoguguxawaposedate.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092802e86c0e---46116125871.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6b381d40---lumisog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unlock+phone+when+forgot+pattern+lock
    • 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_off0000e5c4.bin
b1bab7b224995a47b5634cbce6eb09282ebf90a52b5831f0b8cebd4c4e5ab303
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 17244 bytes
font_01_sfnt_off000112ad.bin
8ac52f9322530732e4bbc0822494e9849f6dafc2101200760344332b94f911da
pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10768 bytes
font_02_sfnt_off00012b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes