Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b658227f0c5d966…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 15:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b9d3c743848ea777c54ae85a4b4a7e8 SHA-1: df05e9c10cf098fa3b4567b882f9b4383bd79d43 SHA-256: 3b658227f0c5d966f74275e6c72546febea54aef859b517b2f6e09ef37a76c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=example+of+hypothesis+in+research+proposal+pdf PDF link annotation
    • http://www.chp.pl/ckfinder/userfiles/files/66781640605.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7069ebaa27e2241491ef3a37e6e76b96/lufikexonariforo.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/46446444954.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c1530564---goduribeba.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/1656051384.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/wezemoweriratiwegemem.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fonatexawuxakunaxat.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/pisexizukidoxirev.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wozuf.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zijezotivekakukidabaroda.pdfIn PDF document text
    • http://artospace.com/pics/file/59425027944.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca48aab2d63---polilexaleropuronekud.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9894b7c4cf---52502103907.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/edc3e0137c923fca6b8dbd9b90dd2f2f/85907717090.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf6ff71b63---zigadebib.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/fobokedarobe.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/gigobegupekijapeni.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/movosaduxipojebaxinebi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf75afc73---xisetizab.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/688bdd5cf4b7a8d5936cbe590a39ddb9/genawawojoda.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210826151805.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/edafc42c64fb51e6399c4154fa784a8a/33058331334.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c8622a8---jisapapifed.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/bilerivivasu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 11084 bytes
SHA-256: 6abf824643f92055d2c24c61a12fc6755e87f546c9ad705ea83d4959990c6751
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 17740 bytes
SHA-256: 62e18a5c1d5db227445e89b004c247bd341903c398870cfbeffb15c5a6016805

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