Malicious PDF — malware analysis report

Static analysis result for SHA-256 5950c375ff7e7411…

MALICIOUS

PDF

74.4 KB Created: 2021-06-22 23:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51a34bd9489fa8d35aa58ca7fcd58f8b SHA-1: cd878fdc64aca4cb3fd0bb4fcb2a1e23bd98cb79 SHA-256: 5950c375ff7e7411246943be690dc5e59f9638cb787e4759f3e8569f56088f56
156 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 high likelihood of malicious intent. The document contains numerous links to compromised WordPress upload storage and other domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to external, potentially malicious, sites.

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://classconnbio.com/img-jacson/files/xemenumilamonopi.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e4c6c3f0---wunosalu.pdf
    • https://xo-sound.ru/userfiles/file/nujeziposifajowatoke.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/usrg65dbdctu7t6a02d9sve536/92506959339.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/be1658dbd5ba1e75a3ea10a83b7aff76/15184735154.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e5eeec2c---94921869969.pdf
    • http://er-trans.com/img/produkty/files/3536533668.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ibkjvtccjec2vudr0fdpr4igcj/wiremupawow.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/zakatilipibidira.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/mataxuwutesedewor.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/38386436615.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160773655ea450---zapibon.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6efb404eba0517809cbd79651b0042b1/dejakuribotur.pdf
    • http://matchonusa.com/uploads/files/rovebafumowagebelesevib.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/dc99a29893c02aa8fbee854e04ff4773/18359208549.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f077a4d1a6---9834975937.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160783327a2193---30414937888.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b434ecaaf---86582407742.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=retail+sales+manual
    • 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_off0000e75e.bin
47fb187a5d401ccf8993a19da6b1fe8cb42989c9d359b61a3e9d370f7cdb2506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 4744 bytes
font_01_sfnt_off0000f76f.bin
a599bc6f3bf176d486acb879b4b3eccf5848f6ff93fe508910118d772f27cb62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10996 bytes

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