Malicious PDF — malware analysis report

Static analysis result for SHA-256 328a83dec5f6c786…

MALICIOUS

PDF

76.6 KB Created: 2021-06-18 03:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b6e801ca064e243ee303d7833a04e3 SHA-1: 758abe57b9812a48d122e29dc98b55c4d623b20a SHA-256: 328a83dec5f6c786325c7d2088b34f4187f3605cc2f3bc2077942566d3ced25f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users, suggesting an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/664cd39937c944ee2e5fc45eb420eab2/41792087140.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8n4dpt1d2e2nr2i4ki9rbuiv0s/24490424863.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c87d2ab---wejeniguti.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2e0cbd76b5acbaf2ed1d001f507fb70a/35775435925.pdf
    • http://alkanboya.com/files/file/%5C/ramolomape.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8riulophe7l4d9c85i59d6d5k1/73787444692.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0d9c51c5f8ff62a8b2c365d0b5a060d5/zezapexepulukusizunalanub.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/38946462042.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c8b1dc773ebc17b177f81a6a68967a76/60285855352.pdf
    • http://drivingschool-brno.eu/files/xibuvomexogovotev.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607afab4acc03---jiwojajisipavivodiraruzuf.pdf
    • http://cortabellanews.com/userimages/milizimobafejuxazetapivi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99431176a9---tomajajiju.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3eb6e2b6c23eba6b579e534670c25b25/kamufod.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/68133550927.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0573de7b3b1cc29e5d953fa65a61de2f/tubunokawog.pdf
    • http://polimak.pl/userfiles/file/24984569362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=buoy+base+galaxy+sheet+music
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin
672c0cc341395e8041988fb59046c2d1c29585966cef17c0f75a8ff491b6a205		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5476 bytes
font_01_sfnt_off0000fe18.bin
d1cc691bf7c2503e11bc5b6e6a3fa980ab2b9c939d41239486a1d964d6e019e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 11648 bytes

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