Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cf0981adfaf001…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 14:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb7a80386a992e3cb5a8da41b4bb2d47 SHA-1: 87a891601142e35cacc05d48cecbf6138ea786e4 SHA-256: a0cf0981adfaf001f4b041a57a93f50fa9ff3cc7b5230734eef1e8a11c741b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=la+marseillaise+piano+sheet+pdf PDF link annotation
    • http://epplast.com/files/file/vilejafoluk.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ae75e6367d5ded39b9883581f5f4d663/mozej.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe453203e---56586375471.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/82156914001.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0uencb9fdq6qa8b4lr54kkotc3/59016055180.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f952762522---zinanekupo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8b8277da---21736639955.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/tiriwidofa.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/nufifupudufikuwidibev.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/ranisunimi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/38785167856.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3711c2ca0eb1e78b85ea33cc59d36e04/7163801381.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60f67986f9---29701113815.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/sakupapu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471a8141b0---55456097206.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c55d9a4550fc9b6a094ce14b7744acca/47183897347.pdfIn PDF document text
    • http://juncheng.tw/upload/files/33758149089.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/31919730395.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/86145450929.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/josekasitise.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fukojomabobimaruvabute.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9714660cde---21025110160.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sogiraratotewikofijusokos.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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 10720 bytes
SHA-256: e0f29d4beb4a8ffd0dd323e360f6811676ff15cfe86437dc20901fb009727aad
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 19352 bytes
SHA-256: 582367bd9f2286a883bb38d4a04f557b5442f363ef4f04fba724b8e66b4432b0

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