Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de50ad634e47458…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 11:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c6b3b64f76afe490f04a043a5c17bff SHA-1: ae7cf276f97ca3c4511987a080bf8b384ef9c250 SHA-256: 3de50ad634e474588fed026ea8548286090d81013fc62d2431412adebbd8fa7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The embedded URLs likely serve as lures to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=modern+competitive+strategy+3rd+edition+pdf PDF link annotation
    • http://bankerz.in/qpic/files/11926072598.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/74e67f3a8874338f2fe4532cdb3df232/kurixefu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kbm5t0lhf9hfk4pknb7kgbc3f3/juvulizamag.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vuvefazofalibupejogebomoj.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/60647934924.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/acaoa3820vi0si64m5gke9g8s4/jodexaxokogemijojuxur.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611e51db81654---pinolepufuvegabopomo.pdfIn PDF document text
    • http://chinalabware.es/d/files/sunosedomitanuzodu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lalosexikidup.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/jatosawuxegivikopanolera.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/60gpbt6g6apssebnqg1ccms7s1/61553533673.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tomesiruxofodavoso.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160771e532535a---lezevedolutagivad.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/misimizewerudirufivol.pdfIn PDF document text
    • https://wecareprogram.org/images/file/dolosakite.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/87464525229.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/33095006900.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/23c5119eb83c597ea1c16d8b1ce6df91/fakibarolunujebederoj.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/69148028486.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/54075781437.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/55994331709.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/97193376974.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160787758c7b32---98399101913.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/lezokiz.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210703_F530EFE2352B9DC5.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafosuvarugasotokofuvovo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68bff40f6---58215538968.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6c3f309e182e6a20e1ddb5ba10564fee/85782987081.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_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 11264 bytes
SHA-256: 1f132579da472ce17f77aded3172761b60966a886d2a2558079b673bbb615506
font_01_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 18160 bytes
SHA-256: 73ad0b8cbee3617796982906d5b9336a64438115901fbd75ab0192077ee72bf7