Malicious PDF — malware analysis report

Static analysis result for SHA-256 9877b7ce3e2b3747…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 01:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c762de87f5846346b0df803a99860969 SHA-1: 933b337747169541c9f4879a75eb763391194c77 SHA-256: 9877b7ce3e2b37473f16ea122436e206e45b2fc7e50f4b1750d73e38f8321ffe
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links, likely to download further malicious payloads or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160778fd0624cc---jadulalanonejol.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6e0f1ed1a9a222ac090c257e4f14713d/9354110763.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a42ccf8f91b208d1584f37379f5603df/gowakan.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f5424a49---85451834713.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/83505268c487a73afd9d9a17c014906e/ponesodonegegus.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/20023354362.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1b34c3cf89274d3751f5625422362c60/tuvavejateniwuxasifobi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/877feda7789715ae74382ffca7be0b4a/kanemuguno.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/44380229973.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/050bcdca039d610bf1692218baecc3e5/tosor.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/sawunafevem.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef60b908a---90784951524.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/xupozarabudomawuj.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/90517135270.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082b149db9cd---mobakirod.pdfIn PDF document text
    • https://33mobility.net/uploads/files/rixalizonigowesexezij.pdfIn PDF document text
    • http://allasclub.com/campannas/file/70693490887.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7fa5f4805abf4f6bc7b043447043168d/subuduvebal.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/zitazixovivew.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/32210525530.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072030ae298f---72471919782.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/sibapunewutodonera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+get+my+ielts+certificatePDF 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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10908 bytes
SHA-256: 76523da1678f4f75a5861c6119e4b3e22e0d74655d2cec092811b0de58f0a9be
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 17620 bytes
SHA-256: 96b2cb4c2c9666b27e45b420c79fc170db1229235a9818dd0590858bdda6fe03

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