Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26cb346af4b6a4f…

MALICIOUS

PDF

94.2 KB Created: 2021-08-12 10:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9a73f3adbe9b7caf81db3df198c1d9b5 SHA-1: a689eff5ac1cf831ab38f86fcb4c6d901e997921 SHA-256: b26cb346af4b6a4f13b70d401771e6e9bcdf2b1d8587be1e0ba69f1815e3bc6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or malware payload. No scripts were extracted, but the structure points to a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4ohfrqbf0kpgmk8c4u85kbjm9d/26537330274.pdf In PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/4840282444.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/054a83105f588a496c4ef7f0da859ba7/80209968526.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5924d8070f---46094978405.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/56339220291.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/j06jmstc7k81151eea492jnj85/moforerupadejerisevisuk.pdfIn PDF document text
    • https://luminex.pl/upload/file/pibikufisaloleroseributum.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/niburozanukejoz.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/zevivesatizijo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a77a85f25---dovugilokexuvivejazetala.pdfIn PDF document text
    • http://contactconfiance.com/files/files/kativepuxoj.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2b438bdd---besilesadavadoxumufowut.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0d93412cfd5fbd2ed7d875db9296643f/24268011588.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/21607024596.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/13728283973.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/58940085891.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d0789909346---gepamedepu.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/157200028260bddf587ef65.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea98b783c---45712572437.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/741bbee54a324beb7b80730ea9674ef8/pifamafuvawadesadixipotuw.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d1f34c0e---xumalujizelupatadi.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/20216914353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dosis+de+dipirona+intramuscular+en+ni%C3%B1osPDF 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_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 10984 bytes
SHA-256: c89787539ee36519d893e0717e7247b7cdb1314396becc561abe0a6ef117a051
font_02_sfnt_off00013c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C03 17800 bytes
SHA-256: be00973ecd93bf73fbd5f7ce6d6c2ebf3e74a3a2652a5039e28eb08875f68c02

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