Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cc9105830906cd…

MALICIOUS

PDF

75.0 KB Created: 2021-07-19 08:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20e983dfb3d2b9dfa946bff3cec97c68 SHA-1: 456288603bd94636d8171e9b73011717c001b0c6 SHA-256: d8cc9105830906cdb873334290462d5d696e08d07214cb7957801b34ad1be983
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://webmenuplus.com/images/file/76345411022.pdf In PDF document text
    • https://markmont.eu/editor_uploads/system/files/90762766291.pdfIn PDF document text
    • https://melz-feu.ru/upload/18572024796.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/377fd9e224276fe35105c1099cc489f9/31941851541.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb7f819c2---49496868877.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/gebuxisi.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/16972532639.pdfIn PDF document text
    • http://klefmarken.se/upload/file/53912660253.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7994ce5b97---20172636195.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c4a1875340616cbf586cc164f330f3de/78994041847.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/zuzikazufup.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeb484fcf---fisixedalusovopuz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g60v7lhhdaacklhl5rkn6tpomt/piwudimixarodelopela.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be49ba0b6---75320779319.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5a21395465bc3fc96ef660c49ec33551/32999996175.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20efa44522---jeromatevuwolo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/657107096.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fawus.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a58ac3cf9---buduzonegum.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/922795de739545bf4d90ee251a97d7e6/piburipolotozol.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fowokoxinivawowu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/wepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gagne+gifted+and+talentedPDF 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10180 bytes
SHA-256: b0207a32c9c942c5843047d97030babea11b51262323c1f11c5c6b1415f2ea96
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 15880 bytes
SHA-256: ba47d97249be92d1edef4ab93828762e642739635c49290941870fedba5571a6

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