Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b26c81d74937abc…

MALICIOUS

PDF

82.9 KB Created: 2021-08-17 22:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aeca75cf9a331f07c9c86638821777d8 SHA-1: 574fd97137484ba532daf6e7bd0920d6e47f7ff2 SHA-256: 3b26c81d74937abc75a131f6bdaa89c1368168f75d4fd57a5b830dbe361e329d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various download sites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign aiming to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mmckno2010.zkosuchdol.info/files/60461599473.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/89617858592.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/xamozepugigimekeza.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a17b51d27---66753162554.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/difhk4j9k7ul82cpjo19rlqok5/64370576900.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/57766005265.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160761073e8d71---58856119282.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/dixalumepudatot.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9420e883e---maxusulumenag.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e5a96ff58cd688c51dbc9c560426fb32/39841353662.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56762c48e9---44588416054.pdfIn PDF document text
    • http://stevis.cz/files/file/42695532214.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081008422660.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/21139234804.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa4c453f18---54063841683.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/41749511882.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca79c05c2---kejubikila.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/75943968184.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zapomizixutodi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/89104176825.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rutitusifigabavuwede.pdfIn PDF document text
    • https://papiratisk.cz/soubory/62898855272.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fd81dfe759dcdc52690897583bbbddae/59516105938.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/52961085446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=grand+theft+auto+v+download+for+android+pcPDF 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16956 bytes
SHA-256: 0466200bd6dd5518f4e4a8ae30f00a023572f150b00c78cc0a7539c7d46441d6
font_01_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 10840 bytes
SHA-256: 93707508af1cdfe5656e7c3202e9e9ba7aa1d5ba0cdb72e029707b80c08eb22d
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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