Malicious PDF — malware analysis report

Static analysis result for SHA-256 74975c5b800525a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 07:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3f6a16fd1d88cff3c30e5cf86dfa8cb SHA-1: 17b6e05a5fdebfc1a2e29a41aafb3862faf12c5d SHA-256: 74975c5b800525a866c6f3faf3696c2fedfe67792a389e6dd9289863a468734b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://laborke.ru/uplcv?utm_term=small+pdf+powerpoint+to+word PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bc475b53---modibagufevixumari.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/50605731952.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/gudutibuzowobaze.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/63932092813.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161252041120d4---77596553779.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gdjjqhbi6flmurvaadi157ops1/95039229861.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/pojalotiveneluxobenoxad.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_96DD14DAF7E3BE84.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/gudoxeruroniwasar.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vekavivadosowozoluvukame.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2flk0k0dm3erkabs6ib4qrh4i4/9861641213.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8c516096092bf4b7994ab60b8e18bfe5/wepubu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/ritekobopen.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/finukik.pdfIn PDF document text
    • https://resicolor.com/upload/files/luvonuligukobaditovofubax.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/41101474976.pdfIn PDF document text
    • https://kuepancong.com/contents//files/pavojudosogezik.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/javibugod.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/25210522670.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/puxemiwufozosax.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/665811a9e91972962cac9ac299b1ea2c/togubufukunabunenaganisi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wijari.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/xokumuzafitama.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 18176 bytes
SHA-256: a79213872d9108e31c1e6a11d7b15196a0733de1f33f7cde2a2448af7b9a8798
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10652 bytes
SHA-256: ea3bb374851e3a9ee958db1dd2ef5fedd055ccccebbd26810f53622b99d0f4ba

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