Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85897942ea26073…

MALICIOUS

PDF

131.8 KB Created: 2021-07-24 01:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 42fa336ccc325db5c437673ee4db67dd SHA-1: a2b39b824dfbb5afe6f4bcaa5b331177e7347edc SHA-256: c85897942ea26073f5805f2276cfd11b89b370c47b9d0168eb2ab0126f1c408d
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external resources, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 5

  • 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 http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/84896333678.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502942a8f8---7347776736.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/69093855228.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lilatorusifufesimew.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c248ea65c0f---mizafozowotajurited.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/770f44ca00bce5ea8c949b8972bbfaab/zejisosokimafisomojixe.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd76918599---memidekevozopan.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jtoe7uqqeibl1kcmgfk4p8geem/valifuxurinolugovawalupeb.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/07543vni2c219qk7e2b3b5chnd/22214565158.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ed3545660cdc155c7f76e22fd81cdc9e/16388868178.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/zewegofowibifelobefen.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f00f8dcfac7b676934b8472311b5624d/38576491641.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lb8kfmmacd3q0bpvk82ltr4sr2/61119959683.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b9ba4d499e0accd152801b4dfc7b9aa8/bidixapuduk.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2461ac54a9d1b5f40b5528af2cd0cdac/sezeke.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/8903160517.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/47519143972.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bovogakobagonu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9pjv49linjvk0etpodubtfqh71/goguzulojedezibadonu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/ratexuzawubeserewi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f5f53ed3d4ef17bfefa54edfd1684798/juvamogaruro.pdfIn PDF document text
    • http://edelstar-mos.ru/files/zuvom.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f592b038a---poburud.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215161529348004.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/rewakikusonapafe.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/visupivamebesipeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fire+emblem+4+gba+hack+downloadPDF 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_off0001a19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19F 17808 bytes
SHA-256: a8ed9c9cbbd02cff2795f94ff6d664cb234f989b4e44e3935f2f8d7a7310cdaa
font_01_sfnt_off0001cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7AD 10924 bytes
SHA-256: d736ea1cb5d7f60bd27f684212b12fabf02edcd611419334d4ea7d8a021f1cec

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