Malicious PDF — malware analysis report

Static analysis result for SHA-256 990582de330f435d…

MALICIOUS

PDF

83.1 KB Created: 2021-06-04 05:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e9239ae335d26ef129a6b10feba6ec7 SHA-1: cbe561ff7d3c782c39c653e7b75d5bf27f137c87 SHA-256: 990582de330f435de7cdd74ff00c337fbe50e1a70d7880b9878ef2310f740f38
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=insight+on+the+scriptures+volume+2+pdf
    • https://accuratesearch.com/userfiles/file/poxipobedalepojexagifibos.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/1655e83cd82706094bc71692697a88a1/81592352289.pdf
    • http://akinmedical.com/uploads/file/voliravupaxevujag.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a141b8c22d7---jolop.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qhj64v7s4ekl8ttgnlc5ipnep6/jigojav.pdf
    • http://simonide.org/userfiles/file/9842930717.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/54917261002.pdf
    • http://grawerlik.pl/userfiles/file/kenasuvugesixu.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce88c6855---zoralejanibukotesubetojo.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/62784f755ec0f84b2188ffb07058f551/24379857103.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8949a8305---34953745.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798cba5d160---364002186.pdf
    • https://mimpishio1bet.com/contents//files/91324888106.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7c1e55fda---fogilatenudoxosedigexow.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9d3ddb5a---nukuzel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b7.bin
6ffaaaa0a0ab16174128ef14db37e9b3f5577474f95b6cf1a2de13de32708fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 5368 bytes
font_01_sfnt_off000109d5.bin
4abaff7bcba655a13505a403a47ca7c852f3343e2d5467dcecd21d1afc162fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 13588 bytes
font_02_sfnt_off0001323f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 4324 bytes

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