Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c805226bf9f8861…

MALICIOUS

PDF

89.8 KB Created: 2021-08-03 09:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7777114d3fe261b4afe93062f649a053 SHA-1: 022f7c4f8851fd054878e75c3d70204c95d244d5 SHA-256: 8c805226bf9f8861fb91a2ba5644692fa51cbef5723d98afa84ccd841795e2a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure the true destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan strongly implies the URLs lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=free+barcode+generator+software+mac+os+x PDF link annotation
    • http://elesi.eu/fichiers/files/80764051907.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/43693712563.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gubabapepusalubelewaronit.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/28945309101.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/463434de9c4793a5b6553569dd9e87cf/sogujutejut.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160856511837f7---78699838363.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/19ed6vdtor51m93k3l3mqd8dif/dejawamugu.pdfIn PDF document text
    • https://hagepoorter.be/files/files/90904413977.pdfIn PDF document text
    • https://projetovm.com/uploads/files/8695040313.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fejolenaj.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc87789a---dufud.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/49785991538.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zijelodibuse.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/056e220e3a249ecab15d2219ed766170/ripaw.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/dareno.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/28472795010.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/wajisawaxovogizadol.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jugufopijumumewip.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sujukov.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5ea748ae05e6a908fc671131011997ee/41264617841.pdfIn PDF document text
    • https://bem-sa.com/img/file/lozenurotugujelatik.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448a6d0e3a---rosoledewibizusi.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kumafag.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a612f42ef10---bewipewipaxugagazarefoj.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tifadexopejesubel.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0918e267---zatof.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 10988 bytes
SHA-256: 84b5c648b468d5b9fccd7fb1a0b3d8aff78f9f2dd0b73a7e9f09064a1beaacaf
font_01_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16768 bytes
SHA-256: 6e7f505a066e8b9a054c94a359605d3f4b85f5308b8e72a3a8a72cdcfe0980a8

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