Malicious PDF — malware analysis report

Static analysis result for SHA-256 188be86a76c068d4…

MALICIOUS

PDF

79.6 KB Created: 2021-08-13 23:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f295194cd56cfb9299c0942f90a0d87d SHA-1: 1272e9356446861e7fe573104f6011c4783d2f10 SHA-256: 188be86a76c068d409b9ccaf15c9b490567399416dcd94cd5f2404c18685d8a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://talleresjpg.es/img/file/83339876595.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42975db6d---towoxotomipufowukabat.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/asb4ldfuu9gvb7u95ri7t63ip2/ziwovonele.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/28708173382.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/230b8f386f5835aee2a61571f413acbc/guripipowudibizepubuxu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bonomovofezafasukixulefa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4bee2f9b---26515235094.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/646007835.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/pamutawidovu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/boqdldgqgo01mhsombsd8253i0/83098474157.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2dd553773---luzebon.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c616ab9f4ae8ad0b887e287c249b9c96/73742914554.pdfIn PDF document text
    • http://evola.it/userfiles/files/kumepopifazix.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/movavasapupexofemesiwaf.pdfIn PDF document text
    • http://bulmarconsult.com/files/jomolejanepedogirilovo.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/zisisige.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/12850542329.pdfIn PDF document text
    • http://coffee33.ru/archive/file/99321638714.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/54256242e482bade41bd3ffd556acfe3/63592009849.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/189579605435210922a666230f2519de/58109480897.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda5294646---71224508544.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/legigodatomowenasalilenu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f379fd5eee534daddca7f5b51f225ef6/7454693720.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mefasefaxekunorinepib.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/suvodedaxenikefakex.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/wevoxajibadefavutivifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jazz+saxophone+licks+phrases+%26+patterns+pdfPDF 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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 10616 bytes
SHA-256: 9690fce3e33a20b3bd26a94fb3350cfe4f521fcef943054d182c157184208e22
font_01_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 18376 bytes
SHA-256: cbe98ab3a4300c37a4963296c15347ae45bd009ec35104af45c0da432884939f
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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