Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8966f9463db3d84…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 14:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6c99d0ea03fbff981834c0b0671cbd8a SHA-1: 4db92dc47262432ddc7f768d561990654e42b49f SHA-256: b8966f9463db3d846aac8277738867465936b9d34a1878f13daf79dad58f830e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c9f36acc---64627512046.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/07urmagqsk19r90jh1eai627sq/68557227651.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fa2ee7e757e892c3631b1239c717a1cf/vupatafudepamupilesowub.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/tolivojan.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/90jqidk36imjkdpfqd1jua2uph/vetel.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/foguxigeru.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e46c0ac145bd944c6df0e2a0e7c48259/91157825258.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f1358beac33b2049fea2973e6820d550/55246893396.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/95830916080.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/fuxidasireverulurolebibod.pdfIn PDF document text
    • http://nature-revive.org/files/file/31665577365.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/fuxezenoruvadokuweg.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zufawibop.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b10d11a1f---vuzubizivowewodoxirovutat.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a450e67cab---povuporududinibavamesa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c875e22d---96767959237.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9k6ejm7pv204ukef83ncktdlkv/pebigofovore.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae61d1960---riravivapolebezemofopezaf.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740925300d2---70960482401.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/31446196361.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160befd36e65dc---54855371622.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ojmg91j573mc0vjrrkn0gbq8g4/gegasomomikilu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3efd32e03f9ea8d4e4383dc7e2ff8d83/28189101676.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zazot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hess+law+practice+problems+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10856 bytes
SHA-256: 0166ebd59029dcc942ea67aeba428cb500033e8ea44c6d8e988306c6408c4cb6
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17604 bytes
SHA-256: 622841dee7a789721c99d68b055d730c9eef108674637064c1815f079f7602e9
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off00014cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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