Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73186a98ed9840c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 01:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72ac3eaee9ae6d9c3e6d397b23b27710 SHA-1: becc8a8d3637325f1904fa063ffd5c98fa689b25 SHA-256: f73186a98ed9840cacf2aa837de9a457383154b63a43875becda342c17d2341b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stabiactiv.com/userfiles/file/71546759129.pdf In PDF document text
    • http://henri-ruch.ch/doc_pub/file/wisekap.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/64688157452.pdfIn PDF document text
    • http://ruresept.ru/files/file/bilavedutokepukude.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/415c5f0f8acb4bbe1efc309b6b33a9db/68305576913.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/favotatapoxavipexas.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/satuno.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/rupagurukuserafiru.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9589496ef0a05ec2607723b99a20e90b/50882871177.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4c106f265156497dadd2975fec33b02c/bopuvuketuxuxigutavip.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/tapaf.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/nirifexosorifalolo.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/98579239124.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b148b4853---70686403224.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/73893771273.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/61512338434.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tlb7asjirqt5iu73gbb5jjca9e/82658865148.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/92014792659.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mulodexorijema.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/55017622343.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074431e4d9db---zenerudadukam.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0189542a43---95280725149.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210824002656.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/1816091849.pdfIn PDF document text
    • http://htwy.com/upload/file/15782368325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mythbusters+scientific+method+practice+sheet+answer+keyPDF link annotation
    • 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 17364 bytes
SHA-256: e4f02de5d49840b938b6e21e69b369749235caa399ed125a1734a72770d9ed08
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 11364 bytes
SHA-256: 4df502437c2c7b94d49e79a5898533df6339c40cfd8a156105d85df919b3fd3a
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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