Malicious PDF — malware analysis report

Static analysis result for SHA-256 f544fa943a1161bd…

MALICIOUS

PDF

64.0 KB Created: 2021-05-10 04:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829f2fafea6a71f73b7f64e549dc013f SHA-1: 70a53519b8394c8991fbfa58b28cb51f5fe446fa SHA-256: f544fa943a1161bd1f575fd1cbfcbd8127e40d6ca233ee11557e2262e928cd94
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm to direct users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=fortune+teller+fish+lab+report+answers
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609737cf66748---zusajozasumepudagofazol.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f664eb2499---samuwexixunejenusezap.pdf
    • http://cuatro-pr.org/sites/default/files/file/pogezi.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d41e9b84---kuvoje.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430101736783364.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416dfa9236---xureli.pdf
    • https://mangonebike.com/uploads/file/49599813573.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3ee63b5e---ropelasa.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edc754146d---wojanadoxamogal.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4cdf5e0cdce2deb6e7c5299b3536cc53/figas.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aa64a79f---devuxomisigajamogunuse.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01279ce4c---9587887651.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d6g052p9dfnrp3o4ebjpgt4m36/15868121015.pdf
    • https://acronimocostanzo.com/userfiles/file/fitetoxarawokolakavomeke.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/80a4577c05aecf0b007d1ff02aec5d22/62380682089.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0d880564---gomamiwiwefusigetibi.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/850cad32d843b6abcd4c8a0263bbebb0/wapulu.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3cbrqb8nio3bfn0p2n0kuh4u12/13242881055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6e.bin
7ab916b6007ec42d190286918eaf70d10d578af8c1c9e6167da665fbfec98bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 5176 bytes

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