Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c4e612e7302257…

MALICIOUS

PDF

61.0 KB Created: 2021-05-14 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec66c15655dee5d7196c27fe44be64e4 SHA-1: 429050190d07d4f1c78900ecf987bfa58be4e97e SHA-256: 37c4e612e730225715597aef19e4991252b2e5bafc439220e627a4f935ce9c84
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to 'cutting edge intermediate tests with answer key'. No scripts were extracted, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's primary purpose is to redirect users to malicious or compromised web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dtcbld8kh1s9amc99ia65o5hs2/vaxuf.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a784305136c66da798f8b04d53698ea6/14582150381.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/126a3eb1cf50d9447fd0e50de26bdf96/gobujut.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a0e71e89321863627a6c202e3dc89b16/didozos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4891f656---43688221159.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4a19f4b9---fikidawaxatotitozufovefu.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee6dec1d9---34275786851.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/802ae74078d4a4bb07928192e1a64994/pelokani.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/egu30s2q5pks452qjlflbac8h2/9800584121.pdf
    • http://asfalon.com/__files/file/72362538502.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944dec2f53d---xoroparanavepusuw.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7e7cg2dffsdjvce51dsf0ap557/60133004572.pdf
    • http://ztkammer.at/uploads/file/75399541484.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9ljbani96fkuf7qbllusc5sq69/bokejexiguvoniwozezoguga.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/539fc9049d2bfc955fd30b365cccfd9c/fedogekakokoporudovezotu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nti0uoju5hgttp6ibnugf29ssl/32043922077.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ram36dmhja8m2at5plhfgqt3s5/foxepeziwuriligit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cutting+edge+intermediate+tests+with+answer+key
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f8.bin
a2ad4218cdaea7cdc4726bb78b8eca5c16fcb0f6869a6c2cb4fd30140886f082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 5368 bytes

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