Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa85ca61a95eac5b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 518d5287de7f510f19f6061d8ab7c877 SHA-1: 1de62ef7bc7419e355f4280c49a18e2c54029325 SHA-256: fa85ca61a95eac5b8421b4fcac6653b3f475a0835072ada963d5b626aa7236db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//84349630877.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d71677e09---2089248280.pdf
    • http://short-story.ru/upload/file/kutomajeteneven.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea3d1aef9---93410709381.pdf
    • http://ajivikafinance.com/userfiles/file/45406950786.pdf
    • http://accessprecision.com/userfiles/file/51026648077.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2729c1dba70376b2f1f14aa7b6260a46/fikevadifisotagojujanak.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/aeti6ltc1e6l1tucl0sr7mfmja/budowudulakebepojegogafi.pdf
    • http://fmi.lu/userfiles/files/87731945176.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b87df99bcffccc701c2e815e474067fc/23818089509.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/df170469144d10ff19d8aef4aa7ebcad/korazujesilejadapom.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/pawipofelepib.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b198f9026a913563f6eb1c627d18a65/mesebezawanar.pdf
    • http://voijin.com/userfiles/files/23871572857.pdf
    • http://zaun-produzent.de/userfiles/file/viboteludif.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092105b6de4b---78099123917.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2c3011174891e6d0b16af259a565ec49/99673254555.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2428207d93b34662e85aaee0a17f8823/56204248078.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/79634246335.pdf
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/68312506437.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3d6f0f0b73a8efd4b0eaa580cedfd662/lagow.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2jhaaammbq4ad8bkkcann21i0d/jodowumojo.pdf
    • http://tsg-edinstvo.ru/userfiles/file/naxewiginomit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=greatest+common+factor+of+25+and+30
    • 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_off0000d869.bin
9c674b8baf65992b6652c4b0e5e07ba72a87420f0d39e8e03a6c75fee16aa83a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 11088 bytes
font_01_sfnt_off0000f263.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16252 bytes
font_02_sfnt_off00010843.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16792 bytes
font_03_sfnt_off00012055.bin
e08b70b1197426694ed436589f4a4344f2f914a8c689f3d435ad37d5b2e9a0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16640 bytes