Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b503f71bf2aa4a…

MALICIOUS

PDF

82.9 KB Created: 2021-07-09 05:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccc67a5272f3f0bec55be50c698f4b4e SHA-1: c65d1e5272fb03500592c29b9382341a9444c295 SHA-256: 88b503f71bf2aa4aa9242da1ac2d44c9bf2054bad45b3db8818fc77050618a06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=how+to+lock+the+pc+screen
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e9e4194---23308991338.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9dce503d22f0383203fb5616def3a406/35808881118.pdf
    • http://alarcon-v.com/editor_upload_image/file/43724830165.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/733fcfa6b4e30fcaf597564f82d6462e/23202718619.pdf
    • http://market-oborudovanie.ru/upload/file/votiruzajatu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/76b2b2085892ab288902dbdc3409e0c0/72661422176.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ec89ead3eb2d56bb117a2455ee73bed0/xobajerumebiwedazorefu.pdf
    • https://landbondcorten.com/attachment/file/630f44d10dcce4c08c47c69fd7b3d7c1.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b91a55aa8---45316248011.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5c7da8844d25840a486bd6a67b43971a/33986264267.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbf51537a---sizuxukivefilopulo.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/5ak05t0pf0i6v54t3vm87659vp/gofajunefisibaxovovu.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cfaf4b51a516f378044d838b0f3539fa/1427086803.pdf
    • http://frezerovka.by/images/fxeditor/file/73314611127.pdf
    • https://invest.pl/userfiles/file/govuti.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/da5836b61093ddae5e6bcb6764cd2d80/tatewide.pdf
    • https://stvorki.ru/files/file/bujuruwefuropot.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c9nou1a3jkrj80mn1bvr72qe37/86184731745.pdf
    • http://villa-carlshorst.de/sites/default/files/file/befijikoduponiwilalomamav.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/od19io1nmvhkt2kv96sr3oa41l/53023923070.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748df6ee9f3---42161939253.pdf
    • http://cabini.it/userfiles/files/titubiw.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0b3fed8dd---33696105680.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_off0000e227.bin
220ae4a3a86a90b5b7f374fc430146a389c3d5a7563fab0c5207ecb4c0d05207
pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 10384 bytes
font_01_sfnt_off0000f9a6.bin
575ae03c0eaa3e74c432a505bc1e69a551d0507e5bf0f29a01bd438de621a1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 17088 bytes
font_02_sfnt_off00012681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes