Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ff788e332d123e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 18:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d829c40d6b8366c1c3e4966b08349546 SHA-1: 1ce33e77df58edf25ec255edbf8f7a776690a7f2 SHA-256: 68ff788e332d123e66b816aa710f6d0a133959c371fdb163e6a9ff17d49399b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=food+handlers+certificate+answers
    • https://dineflon.com//files/xonozuramomumagipedutap.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bf1201a---nunutuk.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938722363b3---rajotatopekajosoxegiziz.pdf
    • http://stark-tools.ru/images/uploaded/rifirexabupolopuveriri.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3803720046bb10976547c0706064715b/kodawunadev.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9ps5agj38l3lqhofhpmghvhqkm/mosonugeju.pdf
    • http://candybeauty.vn/upload/files/sulesazikudibedo.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1962f9597fb913e1a0a7e713b89547c6/89350840156.pdf
    • http://ahkjt.com/upfile/file/42007176137.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/05adef0e5949e40d4490ae74e81017bd/78982544876.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/nec2fa2gbd7qq68319tbv0e6kf/riromogode.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855d0fbe05f---10908188801.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf63b07bf6---givoxomab.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeeaf2346---87965915844.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5eb8b36ff2b0bb3d7b43fa0188ddc26a/katasukudokeso.pdf
    • https://nikosdimos.gr/userfiles/file/tinavasotuketiwigu.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ffa65c1919d164ee5e8c5099f2777d8/26989609000.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79c191239---62612525681.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/derudi.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062307253880554.pdf
    • http://www.bufolari.com/public/immagini/file/bifutipet.pdf
    • http://grandp.ru/userfiles/file/zirebilabekamupekazori.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/dc94e5215d182d51a1f00083ddd34f77/fojurituponibi.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8a23ee7---91624168968.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8ac2131b59523a0231a128851349e0b4/dunikelezajalupawogenob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c1.bin
25a853314e87d93df24aef470c0ec05ef5001b39da7cc0663187e03f6dd8238b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10636 bytes
font_01_sfnt_off00010011.bin
4af74fef3206cc136a4a2bc16188d47cdeee92d59c6db9f42874e6e4a1ec3c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 17376 bytes
font_02_sfnt_off00012dd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes