Malicious PDF — malware analysis report

Static analysis result for SHA-256 64083dda86a81cdb…

MALICIOUS

PDF

77.2 KB Created: 2021-06-19 02:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1fe9ce42baf26e593dc98cbaa4fd1fd2 SHA-1: 33bf1698c5683daac25e1fd061f478fa4ced0858 SHA-256: 64083dda86a81cdb58263b8305118b3e202cfef26aafa3f6b7340588b3e0f5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs and the 'link farm' heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=street+fighter+x+tekken+pc PDF link annotation
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8c8581eaa303dd498178a43219e50f86/polugututusageguwa.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wivugufegoxek.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/40704185655.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0crk2vt9q7krvo75o5gvbf0ta3/73223953321.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a84349416f5---kafirogajebafabefiki.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vuqipc1pr3po6kc4vpv8kr84u4/jowuvajekonimubajosu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac14dd1d7---96541167492.pdfIn PDF document text
    • http://bjjiffy.com/upload/20271743916.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/0pok00sd3h7eh45i5bu4u8lthi/49435432459.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/71ffcb602e7d980b30a47c0f1ca72221/12925935858.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/231c4e993f55f487f575a7f240a18cc8/pibewibixales.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/32854122366.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ef53a6bc---54614577686.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/xojunogamazugipoma.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6177d1e160e52f135f1a876d4a4cb5bc/watavuguvitowofavidup.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210613_85F48D4B79FF10F8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 5092 bytes
SHA-256: 4b1ec402fdf24f9f9385919d7157dcf7a829f85726c26402449a00d96999d4e4
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 14596 bytes
SHA-256: 30e29cac964067d9be6dc01a9b525947e5ecbf49050b05aaf0e280894680036f