Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42632ca797a342…

MALICIOUS

PDF

88.4 KB Created: 2021-07-31 12:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a02844e85f325d167d1e64ef8b2594e SHA-1: 498910bfd74f46116c1a76c04bc99bf251ace757 SHA-256: de42632ca797a342687079947c07474d25af2e45b66d5f8b129bd1bade29d7fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to lead users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=lage+raho+munna+bhai+full+hd+movie+download+480p
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f5b5f25836c15f131620585b64db389f/senaxusiremubuketavovat.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/zojerosapolemosew.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ad7b0f92c944d3316d5d15343931b3cd/36556112024.pdf
    • https://artbynela.com/uploads/file/fosiwen.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/89052365085.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082025d46510---17097572378.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/xopow.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uqmvd3k0jd9rjjsfsflg2rhlam/74688184243.pdf
    • http://kamerton.nl/clientfiles/nixemefijonujafonu.pdf
    • http://nowator-zpu.pl/userfiles/file/85655676146.pdf
    • https://rieker-consulting.eu/files/file/23041471773.pdf
    • http://angarakshaksecurity.com/userfiles/file/sijop.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a3030bd58d44500905c05656b99fc0e/xawuvonesumop.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/lemejisowakawute.pdf
    • https://vigiweb.cl/dinamicos/files/file/43161264630.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508143043144.pdf
    • https://syteq-pro.com/userfiles/file/tatelixi.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2aed395276641e4428e76b2be671539c/41841324573.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba5185378ec7d611ea9e85e71ac6d8e/74445248731.pdf
    • http://hak-al.com/resimler/files/69848856187.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33e4bd97f6997f97fb226d43f674bca4/10381538454.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085435e22c91---74134818983.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6e20dd5c---ligekolemajosilivesa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1f.bin
06662c0617edca9eeb327857492d83c5891ec02c8bde7ac0f4196d6226b88ec4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 17892 bytes
font_01_sfnt_off000109f1.bin
8656917ed79e10fc705771d1fedb162f0fa3413e477b2a11e8bca046ca9a8603
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 11436 bytes
font_02_sfnt_off00012450.bin
7546d6d9a25f61bdf5d4db16be00bd26a35242aff176fdb63389b4def63c0df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 5392 bytes
font_03_sfnt_off0001378f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 16792 bytes