Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39c75343d673336…

MALICIOUS

PDF

92.5 KB Created: 2021-06-25 14:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b48167c095fb4174da18f477cdcf4804 SHA-1: 313bf701e8bf1a2f80ac85ba0e4c0def3474ea3f SHA-256: e39c75343d673336f631f5366404a722db0617de82e480505da4023c7c26c1cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous links pointing to compromised CMS uploads, suggesting it's used for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/beebd17051252bdc31e8d420e5efe476/zenunejaxenabonoj.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d59fa945ef5ede046017cbaf26aaf203/60181599371.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071c90d16e94---wobukuvixoxakazidima.pdf
    • http://fundacionecla.org/resources/original/file/66809778113.pdf
    • https://stef-nancy.fr/upload/document/21818512619.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b885d6dff54---goriwofagojix.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uvk155ukffdoqdc1ciigcij1p5/xizoma.pdf
    • http://ahlhy.com/uploads/file/290555465644.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f7e7306c---41506397968.pdf
    • http://kryotherapie.net/neu/userfiles/file/62821035112.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a69df3888bd68b7f227419ab2bc54bd/luputigixotedol.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpe8ifve5luc43og7k7otuc5m1/kurukowatazovoxotetaligo.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f8b98d1c625931698ef24042fd50f020/9294648275.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a918c9e5---83576377605.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=poor+electrical+conductors+in+all+phases
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27c.bin
ad4855b6db84469051efabaf1651d6283fcfd52f2eaa4b0412b2369c4b479c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 24712 bytes
font_01_sfnt_off00011ab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 16792 bytes
font_02_sfnt_off000132cc.bin
921d5693bb61cd8a084ca65fcb342e184849531454b1dfaf7c4d95856718cc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 10712 bytes
font_03_sfnt_off00014b4c.bin
b482ee5985c76ed9033d5226bab8b92518e2b0d0574459a5179cfdcc6108ff3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 16936 bytes

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