Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafcf1f964b8505…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 03:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3d7400ce41fd766dbed923668033a5f SHA-1: 950e3540e5fd23c6cc040a8268748d91debc73ff SHA-256: efafcf1f964b85058c873a02dbe15f3bb7ba6af18ad6eeb5300dd597ab3cc106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI links and compromised CMS upload links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=self+service+laundry+services+near+me PDF link annotation
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/492c39j4loa0r6k66ibnjvdm66/xefog.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/72584869979.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/73506643758.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/152507989b93391fe0e6d500e915e1f9/wolapikadiwaki.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8658777910---55436485086.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b997146d8c---84403999470.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/37858508184.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/goxamudonusajiro.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/davitazowesek.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavivonawidizizapelax.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/47207227409.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/69817025861.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/judinutasore.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/nudis.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be06d0811f---43481350346.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/6174267048.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/pomebufed.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/18329302284.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/21559564944.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/6b15cccd1f9c9ec9566742ec4f6d9d73/popuziputigavute.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bae7b345e---24556895921.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/906141e00b5e74e518b7fbc9ad217115/64415422997.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/kopapugedawote.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/bajomexinakofesedef.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/xinugurumelexit.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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 10772 bytes
SHA-256: ca14c21a2f25d1267e0e08f7d8616f236336a622c7b6ad6902d41faee5dc57bb
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 15120 bytes
SHA-256: 241d790331108a157abb13d985622631bd0af52e38b8d64d53e00b903eabd3f5

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