Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cea47d7d9aeb59…

MALICIOUS

PDF

87.4 KB Created: 2021-07-10 04:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a360e4f4a651e15ca2296e2db880aa51 SHA-1: 3ae66bc57976a6e72ec57e0f6488c92f49bcef4e SHA-256: 20cea47d7d9aeb5989c008567bcd1d6474bdc2455b37dbbadd7d54e1cc1fb5f9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=7+seals+meaning
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949f46b8dbe---gomowobokegi.pdf
    • http://timapools.com/uploads/files/sivixazu.pdf
    • http://automotiveenergy.cz/userfiles/file/36549803335.pdf
    • https://alutat.com/data/file/63901209882.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/xivew.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jo40p6iqdpsv7627qhd1vm6r75/futebe.pdf
    • http://lt101shop.com/userfiles/files/41008634886.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/oo1drf3at0igblrf25folqtlc1/jarumerufuposaleg.pdf
    • https://ktmcollege.org/public_html/userfiles/file/vatirorejelitazolumili.pdf
    • http://thefarmatarapahoecounty.com/userimages/tisopabunetok.pdf
    • http://csc-021.com/userfiles/file/20210619193232_s4e1xv.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3c6eda2c37747b9cbbada4b80dfd2b29/93785914772.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9098f1fe---sukatabanejejezi.pdf
    • http://soflocops.com/clients/67403/File/72422512873.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d20d2f407b57934465898ed77c83c37a/69171744536.pdf
    • https://people11people.gr/uploads/File/41566753350.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a21d11e98---tifunadaw.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098693b11ca2---50882203482.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/phkoltmcts2kpgmb4dis7ct2kd/gudigibep.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2295e65e88fe0055284c64d6fbf3b12d/motebidovopixomebiron.pdf
    • http://vijyaiprismcrm.com/userfiles/files/30739459948.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/molikirinalurubedunetul.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/68b040387c0fc3afc51ecc12a473e26e/pixijejuj.pdf
    • https://swift-tw.com/lcc/upload/files/91534721728.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_off0000f59e.bin
17ac8b4da1328a3b4bb3d2ad2d8c48ff5a59392d644f0a86981126ca6868b12b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10084 bytes
font_01_sfnt_off00010c01.bin
b76778cabbe016c671d1c6c6136486aed320300e8ac720026aaeedf1613025f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16968 bytes
font_02_sfnt_off00013861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 16792 bytes