Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56722ac17482381…

MALICIOUS

PDF

73.6 KB Created: 2021-07-02 09:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24bfcc9cdce37d56ed644c1ed705e8ab SHA-1: a3de1853382d8b2f839f55bf9aa6811aaefc007c SHA-256: b56722ac17482381448e88922f17732afd879a3f53168d6fc9c5020ae0eabaa7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many external URIs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0590a2d43---23519079086.pdf
    • http://leaguengn.com/userfiles/file///fegavevokofow.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f467d36ba8---tejiwenipegagak.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/kagudugogo.pdf
    • http://www.allatpatikapecs.hu/images/file/zenevul.pdf
    • https://pet-fashion.ro/mm/file/podivewufabu.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/26109377046.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82e5a58f1---91342465106.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed3f278f5---25992028603.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/91914a222093047b6f3403fe225d91b0/23905549503.pdf
    • https://jxloanchien.com/style/postimage/file/54229818216.pdf
    • https://dm288.com/slicice/file/93383408743.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2lk0rplp1328c418fhqv3hrk4b/wusepajosotoji.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160741fd5a13ec---wetuvuduzenoruduwaripo.pdf
    • http://interwork.sk/userfiles/file/16982150935.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d864367c---jakatudu.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/potikatefogogafakot.pdf
    • http://allamericannursing.com/userfiles/file/wovavotakivuxitudovugi.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f9ed01mbfrmib61mpv8v06irea/6418603386.pdf
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/76273538913.pdf
    • http://vo23.ru/upload/file/86898062316.pdf
    • http://archimax.ch/dynamic-images/cms/file/xelarubakirada.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160929e2f0e61e---79142286813.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=greulich+and+pyle+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_off0000bf58.bin
f30496d6b88354cfacdb86a2404b9d40e3dd85fc5f7ccc2611b678cf3ed754a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF58 10584 bytes
font_01_sfnt_off0000d75d.bin
8d83fe81b6f83e6056e496e09f41791405e507faaeb4dbfa91775287851fa32b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 15708 bytes
font_02_sfnt_off0000fff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes