Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cfb81171d75bff…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f41d50e250a82392bdd3a40f2ddac22 SHA-1: ff654d978a2750484f998f6c1c1d95a193ad2e2f SHA-256: 80cfb81171d75bffdc1706c64d421717bba1176cb2955c3cf9c565a1aa1a244a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised websites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to these external, potentially harmful, resources.

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://drafthe.ru/uplcv?utm_term=catheter+ablation+definition PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/51073127792.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160718191e6269---34121819476.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/99cf7d23f4c118d6e25cccd361b9af75/32060008130.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/4677776739.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070699d744b6---ruzuwedaputunezorufoba.pdfIn PDF document text
    • https://airshow-bg.com/file/42862250801.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b1752012aff7adc1726e6c552932fd39/zulalukipa.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/foxipolimuguz.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8mmjac3c8l7vfmm3q92g854jsv/43781905799.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a521c6573---rojawebireb.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/7273759727.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106200942074315557klev35mi69i.pdfIn PDF document text
    • https://telenovella-bg.com/files/29181338439.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/12226993553.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/37545326160b1716160540.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9sdo9dhjl4l6htfmfq29te9056/14516268270.pdfIn PDF document text
    • http://petrduchek.com/files/76981240519.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/fogitarijuvaxunago.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/1116283371.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/94253940712.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d2696003f---34984933986.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tolafema.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/42198796367.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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 16712 bytes
SHA-256: 7c5c1f0a8d775d94a868f400bdf7184f622a93950e402bb20483767506e54546
font_01_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 10452 bytes
SHA-256: 3f495ed99c564062e2cf65d4ab31c4bede7cf205bc50fdcf00865ab9a3751357
font_02_sfnt_off00013f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1