Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1423c2d796a052…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 22:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 413eabb8d13ea9dbf4a8be88b66fd0d1 SHA-1: 760553cf567093cfe9029f672e152f240ff9eff8 SHA-256: dc1423c2d796a052dc08e220897b5b79c0cd7d6d6b0188894fd581904e278f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or a distribution point for malware. The heuristics reveal it contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of numerous URLs hosted on potentially compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3b68aa6ae04509af420de01599834dac/wezew.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/44b33646a40051b6e51cdc7bdd11c750/judepewisamipusesu.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/jamisivofuvaguzekiwe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608656bb57583---suxubasaguzadek.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xutaxopikivam.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/17423747897.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/89718982376.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/buwajajifaluwejosusujoti.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9646fd7ca4ee226b64bba7dfbf22aab9/biberomoxi.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lipago.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/aab2ce19fe60b31540f15e66359af7f6/28704802160.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/vugamusexuguxikosagoj.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/wurokebomurajamufujutu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e6e494efa33c604f489dfbf6d6ad7dde/xejugopenisozuw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2698b19c6---duxigiritokajiboda.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88867714e58580ecef4b236db45d03ba/tejaselijigijisitetugabef.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/nogisibe.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175cb79e61---48886918406.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1132b4ab03c58bd383d1c84a0b4dd48a/24248895296.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08a06058d---14962804494.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/52636456244.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/75ak45cv0ebguldqrpf07ac0a9/47049689096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+secret+painting+room+in+minecraftPDF link annotation
    • 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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10948 bytes
SHA-256: 4e58ea3aaf150bf41e82ed772148d5a96927b060c883030c18c9a0f476297bf3
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 17256 bytes
SHA-256: 001265b1ef452cc65535eb61fccd4b8d78bab97f39c8b7cc1b7c91bd4d29aed7
font_02_sfnt_off00012c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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