Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a42aa364098982…

MALICIOUS

PDF

100.8 KB Created: 2021-06-27 22:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1a522ea3a4f347328f307f5fd13bd1a SHA-1: b353a4ad0c107dec60d4c81c714e4c7dac414ee3 SHA-256: 17a42aa3640989821153758f8c80eef479af2a4a0d0ca1a713148dea8179b47d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://inwebjor.ru/uplcv?utm_term=visual+snow+and+floaters
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccc19ab22---mavizajukazigexusidep.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc39639844---6976861636.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094316f0467b---26723435801.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/olf58511v6rdc4qrp7qgf4jku1/90549628569.pdf
    • http://alhouti.com/userfiles/file/sunugomaluvigefivu.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797aaaab898---damewutabamopovelelok.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4264988e---xuvukanativazil.pdf
    • https://mmszke.hu/files/file/25070036485.pdf
    • http://sarljarry.fr/userfiles/file/funejeluximekok.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/22202490753.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/898e1035a6a1d0728f3586c906d880ba/31695390456.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc23188ad34---59352313207.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/a89ea30be9f71464da4dbf96bae99c88/85869332176.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5i58bi9pvh0uorcs4cnttdig5a/28763286470.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o6009ejnfk9plomh6754bossa5/vodutoba.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/22071711218.pdf
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/wowoserizagopivituribezot.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/89409456541.pdf
    • https://plasy.com/uploads/file/vasotopoxobazulowizi.pdf
    • http://marthomaiticherukole.com/userfiles/file/60487055659.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/194b56373d19045b5945c2f1bcbee43f/wumog.pdf
    • 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://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012778.bin
2f15cb5e87542c960dde4640c9c8d47c630399fb6fba46d58521828f8ac13b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 17940 bytes
font_01_sfnt_off00015634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15634 16792 bytes
font_02_sfnt_off00016e4b.bin
9dd76e467a8ce00fdc602021e047c2812a66cdd7f77b14ae7ec0f77daac40f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4B 10504 bytes