Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37959fa7e000482…

MALICIOUS

PDF

91.1 KB Created: 2021-08-10 09:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aca5ff9b4bf0aaa4d14b14aba6bfb910 SHA-1: 7ee519c31046230261517eccb9f9ab592fad173a SHA-256: a37959fa7e0004823dd0cfbb33e244d237b8ad53113e50a9c1ca891817135c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://vleek.com/uploads/files/misijologedaxobamusa.pdf In PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/gaxawiz.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/luwonipomifaviwuvavel.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fccceca3---15940049594.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/45315927635.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/sonazovuponikiteweta.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c087f65e---81958319128.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jiwipagilusazifipuwa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0778d17fee---nibitimaburivude.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/vijapomagimepusikofara.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/86116195608.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/nasumegavomiwalenutur.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tufedikova.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/vakomamejekarasomabogoxep.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b398e7196f1---xowadilaguve.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/talitukoxex.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/dcfb7990f9f905fda3673ea473e81b3b/96980771372.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982366b121---31746357096.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/14099159686.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/sazatax.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/vidarovepokagevozibuzeko.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/runawiwevefukugeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cuento+del+patito+feo+resumen+cortoPDF link annotation
    • 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_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10912 bytes
SHA-256: fdced67bf5bc6e5283c7f7ad98f2da7f96186c08986030bece3eb53c554b75df
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 19124 bytes
SHA-256: ddc035998a0c6bfb337f9c9f37480bdf6c6e34805359dd48459b6db6e4e4261d

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