Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f087b288027082…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4eab97a6fde8b6cdd17f4d46ba08905e SHA-1: bb2b5793ed42b2fe66df5fe0762f51f2c908d10e SHA-256: 96f087b288027082f7ceaca99044e6eaf7aad581ba210c57b89ef1dd52ef627e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://demkapi.com/resimler/files/94481537977.pdf In PDF document text
    • http://zhatuogz.com/uploadfile/file/ribenetemopunironun.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8f36b3aec26d1bae41f0d5d542955909/dutizesosibezopeliv.pdfIn PDF document text
    • http://mamam.by/upload/File/file/7018318464.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wefelomufuba.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/bemodefasutojoz.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/53410476261.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/rovipijexagu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/15634636210.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6b360e20---filokipejok.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/gugila.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/panevemasi.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/tobigi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2157dbafc5af761c9c32c0c3308f36fd/fulegatesavepeg.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/295a6125ef6bfafd68099728ac82c2ee/84149418117.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b6ff85345---rumusumun.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/wukukonopalez.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f7784d4bd3192f07eba07a14e8b95c25/98340963074.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/623299d62f1f15c28be7a5db529e0e4c/80670103706.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d497c57545---85820158041.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/bitogudibiruxabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=physicochemical+properties+of+drinking+water%2BpdfPDF 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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 17456 bytes
SHA-256: cbdca788635a2a778dbe9e866e3beda4fb65bac3d057aeb848eae6105d78f812
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 11360 bytes
SHA-256: aa60ee7247b7bdb54fd63a902e2c79fce1e7c76d30a2d51eb83b34a927591ff2

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