Malicious PDF — malware analysis report

Static analysis result for SHA-256 453d45b3bbef9b3f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-07 09:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b79fa0e238170d949979fb6af7f5ec7 SHA-1: 4810ab8903dd3fd3c84110349a7c9a1e9f4fb9a2 SHA-256: 453d45b3bbef9b3fe77d1c4d22b6abdb04676074396590bd97985bedecea8431
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It leverages a link farm hosted on compromised WordPress sites to distribute the malicious PDF, masquerading as a free biblical commentary download. The presence of numerous external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

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://huntic.ru/uplcv?utm_term=descargar+gratis+comentario+biblico+matthew+henry+pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/15474914185.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f622fab3dc---gefafajutuboreluw.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/berrcpg3mieg94re2tu2df5o7s/tuwubekesopetikod.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849cd4c656b---fotusaretobidifemibar.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihnum5t3loceqfm2adjgk04ug7/55051887336.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55030b37b---wojegikaxufekonelodu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f882a08b---78645826666.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f85ec4ec11d62f03201ca9da6f7cdea0/fafujunazurav.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb80566547---6596723392.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50d799f40---makipa.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/m9eutr124dpj7hdpr98uaisqmi/wirovufadewotugok.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/de637096169790f37b8537f1435c1309/94688526784.pdf
    • http://adria-ex.com/images/blog//file/diduzekiv.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/550505ff474d88a5c4ab9632a9e72745/94223208317.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4222a75f76c263b5e204ac10b1a401a8/navisitakebuwa.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/fkm0r52tk3hufns70hipa2ph40/71819823817.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28894c604f06c0aa5ab399e19081e861/13387888558.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_off000124c6.bin
ade7adfcbb16eb7aca1d6fe50160fc0624194336c9284d51587716c761105776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 5904 bytes

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