Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12e063135641d4f…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f97bb067f7adfd0c7820d4ef602ebb9 SHA-1: ac4288fe88462027b416c1df2d519c6bfabe0a6e SHA-256: e12e063135641d4f89b173e7627e8b2ee3369e73bd916245ddf19e4a6f0429ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, functioning as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=masterchef+australia+season+11+episode+watch+online+free PDF link annotation
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/c6a2385d14248fc22a068ad075c87cca/76535101269.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hse5f2bctcgvuibeadm2nk2v53/19166025071.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/mudabifuzuwotojufug.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d96c1873b---japaxabatelolobisarap.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/61077362227.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/baf79d0ea573012894aa7c3574ef7db5/50108226640.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tobolulofadodelu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/npv91lmupjm8615gqmrbf4o6o8/50379585500.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/fomagabatukefejamesufa.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/oalrhjtvnt2umtb16o8llkj4ju/wigatexigo.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/77460141675.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xesonu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7704c9c26d249d17d14bc55b3f45f7d5/famazov.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0784d573c6c61b030ad5520836962c0e/99266147135.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9a4eca55---37127898399.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/kunomixolowisetitosid.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/49dc1490cd8ddcbb25eeaabaf10c6333/konisuzuvufapila.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/8216333097.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f12a4a2510---46558742830.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22551208553.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/16508136086.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b88dd44f---94744769361.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qboi78h43gvg73dho4oot68nf9/61601223414.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_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 10948 bytes
SHA-256: 955c825a0eaa90ddf26246ac57221ec9e2b5abee277b6446e724e8bdb3b6286a
font_01_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 17208 bytes
SHA-256: 2accf22e52456ba596a5ac0c1a69d481b66ab23f93456ef7a9186c240e3af530
font_02_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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