Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7777e83ff5a7c7…

MALICIOUS

PDF

91.4 KB Created: 2021-07-02 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c9884cbcf928880a66317b97b69267d SHA-1: 99427b43bf070b34fde6ece8116c639ca79ba5d0 SHA-256: ec7777e83ff5a7c7db60238e539c28cbfd827c4afcf7acece7c8fdab4081a773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=get+text+from+pdf PDF link annotation
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d309aff0---97483769236.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g27ma3bljrr0ir23lsukeo01ir/47348111627.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1282f1198---gepunamifam.pdfIn PDF document text
    • http://chikatere.com/Upload/files/25662460579.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609451202c430---78131856891.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607af470eb50a---zuzevoxibunufa.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/ditulofewofurex.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/nunijasabibefirilex.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8db62271b---bopatij.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/15471010923.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2281f350---bipekowepinijimoravi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/rowubekuzigotagowulusa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd79a154ca---vilapibabalajapuwusuv.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba60d195a62---relumama.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1df060c97d7ec9e6c7dc510be02e3b91/55690939978.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/7174345406.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b3c6100fe7b5e1410949496177b7759/12974683512.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82d39a1afa27facc75d1053fa9bff153/gopikagajapukitesotabi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ecc379a---42224478987.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/38087606849.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/buwaruponi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/clf4frnnb2h0kpm1jj3s50kb0n/bixumipuposidobogi.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/benimifetasogix.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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 10228 bytes
SHA-256: 8bd04f2ee0a88d77acf4c0fde50eccee6d1cfcb2fe39cac11fe90e501b491433
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 17844 bytes
SHA-256: a44c3c36929c83ebf0bbf1b4610734414b40e7d7d76ccbecfb28dead8f9b69ee

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