Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b3bb56311ac543…

MALICIOUS

PDF

103.0 KB Created: 2021-07-13 21:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a82045c5cfba69789dae8099bf8a1b9e SHA-1: 0fc5bc89be6b24ea9e71aca62edc87d5b73faf34 SHA-256: f6b3bb56311ac54346aa4d043850770887d53727fb0aa6a196947ba61c209348
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using compromised legitimate sites to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8c852f95295547b8f1b51ec4808a7bd9/43763252781.pdf In PDF document text
    • http://parkhighclassof60.com/clients/871169/File/xubifuxofavamitinuworu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1c539e5c4e902544fa00193f2c33c226/jaxinukin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943755911d1---98899994528.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8d31f55f9781f49b1e2768704b752730/dapibujubipow.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/20574883866.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869d15d4e0b---30272017643.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccacae67dec---fosagijolidi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/sawasovobawuserun.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/88470168426.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be525789518---21787002810.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/dfab3bd7e56506c8e68c09c1b30e98f9/mapewuxisuvi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085758182046---43170832492.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e502208137d26733b1a87c7a834d3500/wavelezafuruwebojuguni.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fomajixobozabixew.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2o4b2cvakne95djj377b6jq546/31870831156.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/27b9c963de0fa7535c843e52b3583a61/75235210323.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a9a4a1f5---59309717244.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607260f17092b---68356033171.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bda6a9ea---53792618723.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160888ab636703---fesasutixina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=243+country+codePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c618f4f3f6f2516bfe6ce72e0d1aa1f1/9185017968.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 21092 bytes
SHA-256: d4cb0232de706c4ed69c7c72ad21f9644fd50c29a0499859634187f46f052711
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 3680 bytes
SHA-256: f4be666db3152d10a52170d96cd96b68c84361e0f6a37140967f331177241bab
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 10384 bytes
SHA-256: d0691d1900a069b35fcd4c4eada63c119bfdaee4a886edcc7fdf37ba14f2dc76
font_03_sfnt_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 27668 bytes
SHA-256: baf938827e3defcd92e3ef1aa871aff80f94ded0fed4725db38c9baaf1838ace
font_04_sfnt_off0001760a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1