Malicious PDF — malware analysis report

Static analysis result for SHA-256 05abb813c656bb1e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 21:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b9958175f4f45c21f5c0491000bff78 SHA-1: b72e67482cbb040c8d4daafcd67f0680195de6ce SHA-256: 05abb813c656bb1ee3f870833875e35f85efa50f9c5574ad6ec35e7611445999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=deep+six+meaning PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a8e500945f83f7d3a03379a88d5c94e0/27036302452.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/99254498857.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ff3eb19b---tamowisik.pdfIn PDF document text
    • http://vhz.cz/user-files/72039994834.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xiselajalalipazig.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tulabisalosekaboguri.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/83989836094.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111a758869d2---nukuzolinuwatosimizawaz.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/31058437830.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/33474187015.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd06b6c250---kelatilixasagup.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/26076887170.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160854949b6a87---jekizax.pdfIn PDF document text
    • http://megalaserasia.com/upload///45760809467.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumowilikapegolaros.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc4284f18c---17797937762.pdfIn PDF document text
    • http://hejia-ele.net/upload/pukememoketaxakurenod.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m8vnmdap4gqm9ik291uagdrpeh/57789351620.pdfIn PDF document text
    • http://specimport.by/files/files/41711056933.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7196dae04---niperonubulutiwiv.pdfIn PDF document text
    • http://artospace.com/pics/file/bamonasizorobefod.pdfIn PDF document text
    • https://icbacademy.com/upload/files/71322866232.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba6da0b40---mopewewamamoboder.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 16864 bytes
SHA-256: 94a7bd34f23b5bc93d09517e542cd69701fa845d17b1741161de7c581be5e045
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 10336 bytes
SHA-256: ad67e47f3104160140efcba9d8d04c15638751b9dceb735505011467a906f752

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