Malicious PDF — malware analysis report

Static analysis result for SHA-256 921c8a46c06467ab…

MALICIOUS

PDF

95.7 KB Created: 2021-06-25 22:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5b7755d985bb7f5deeeb9584fc3001f SHA-1: a6bb74d166fde242019af1e560c48b27f8a159f9 SHA-256: 921c8a46c06467abfbb48c375475e30b376c8a2bc73aff17785513e257578ad3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests tracking or campaign-related activity. The primary goal appears to be directing users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://pistant.ru/uplcv?utm_term=flame+of+the+forest
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d9010627f6d939403820552ac5352b8f/rixawegatadopujifasakekur.pdf
    • http://colescastle.com/clients/875019/File/90144450995.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe83a931b---zerasoninuneteja.pdf
    • https://toskov-yordanov.com/userfiles/file/gufixumukuwaxunefotosuto.pdf
    • http://dawahcity.com/userfiles/file/gexanu.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5c29bb79b37ff062bcb48991fc6c9550/25866438411.pdf
    • https://sanipacific.com/attachment/file/84086922993.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5932f6c---pimixorinijivolobo.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58ca08e69---boxenepitaw.pdf
    • http://kag.fr/userfiles/file/jadorakalutig.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da8606ee6---fotukexoken.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405d564b91---jatuxumokamifupon.pdf
    • http://circolonauticofavignana.it/userfiles/files/rebexapopegafejuju.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7f4a1e3692f058b1cc6659a66eb730a8/bajiwivelawovati.pdf
    • http://airconbank.com/upload/fckeditor/file/lixudasanimikasukunipake.pdf
    • http://wo-kop.pl/userfiles/file/novagemexor.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0ff606edb7ecfe5d2162094d737d9dc7/bukigusimuwamezidevakid.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb5089d8e2---rowoxa.pdf
    • https://tezerwatch.com/file/upload/files/06-15-12-01-19-91.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879599cf47---pujetidalakupijutafuju.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ochjskisiqbc8bmpbfs703i6b3/xofedebazefu.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3ac9dea45ba28a5cf1bdc323d1953a01/59945038705.pdf
    • http://travelport.pl/userfiles//file/gikekotixe.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a68ad2453b---98121290379.pdf
    • http://novussiteyonetimi.com/uploads/file/xuvodimetap.pdf
    • https://musikkursus.dk/userfiles/file/37552162832.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ea.bin
02fb53f233fb6ff462743715f05616b25d384de818b2faaeb4776d0e3eaeb998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 20440 bytes
font_01_sfnt_off0001181e.bin
61cff9fc4df574d8dffdc0e9875bfeb0215ad25e626bd1c97b4e372cdc2e4eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 10260 bytes
font_02_sfnt_off00012f28.bin
c7dbd831e920dfa5767f766696fd73a5f4ef656f6af1506a3370032c7ed0f6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 3640 bytes
font_03_sfnt_off00013d56.bin
ae7176d5f356ff6e4049cc018fba2bfc97179591c02a79d249422644587519e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 17204 bytes
font_04_sfnt_off000156e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 16792 bytes

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