Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8468554d69c104…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b412688f1295d2006b272f70124a630 SHA-1: 8cc3105f96729f015e3c4402acfc740936f97f67 SHA-256: 8a8468554d69c104e2fec095b43fd063f19ae98056b73deea770eb02e75bb594
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73bd746d9---mominofe.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4bfe8bf6e---logebovolu.pdfIn PDF document text
    • https://sanagustin.cl/files/budowujobatik.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c918e61e313---lotafawifosa.pdfIn PDF document text
    • https://birotex.rs/images/files/wuvutobesefiruniveraseb.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bb20cec3---javarenuwomixexigotom.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161269d1b067c5---56332113284.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nabavuxizukurukalafozara.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/fepetemoga.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07529db506---54100184911.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/72629219344.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705e9a36159---rumuvigukozozuvusipape.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/31919652854.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/8177975405.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90207218404.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/kumazeje.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/madovajujokitagem.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jhu4lvfpct1i5atjtk2fujm061/goniruketumozumavowo.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/72826230415.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/58ee38373a2705b4ec013125f4ee2002/9002795337.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/imfodpqd8rtt6k5hu6j09nij55/mibabawudozujipujape.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb982c8401---migon.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/54682080710.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685c17b1e9---rilotiwiwaxefugulote.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c658adfb7---66709001190.pdfIn PDF document text
    • https://steammining.com/userfiles/file/95906910656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scope+and+delimitation+sample+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_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 17808 bytes
SHA-256: 0323577eeaf34b55de1e6d69cc62742244294bc64fb1beb00e2205a5c5482e69
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 10756 bytes
SHA-256: 24ea74aa45fcbb621361c226437c44ecb22504f847c8099c44dcb04470ae3bd1
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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