Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e93b831c1ab82…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 11:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae22f849b537abc877fdaece8dbcd730 SHA-1: 4cbb06d662d6ba7dc1dc99023d94de24a6b7c376 SHA-256: 900e93b831c1ab8243ea654ff5f5fac30b9c7fb9d1fcc4e0e4340c0a8365f04e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=play+store+download+in+tv PDF link annotation
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/sibalikiruf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161416333d698e---74269183663.pdfIn PDF document text
    • http://panova-art.com/files/file/dugolisawow.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rekibuxorupulaviv.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/10495391471.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86476854407.pdfIn PDF document text
    • https://ekransamara.ru/files/jenogemonipemikuzewoxara.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/37318800031.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/gimixawerisoke.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kelagemaje.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/69569134689.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4ebcfc12ad03574b4a42528f85f62a35/59455280628.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/74373188988.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/55029221366.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/eae98419e4faec2182d2ff7a6415ed55/65452188491.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/37763426414.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/vumokanuzavu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/dukepivajozesalefa.pdfIn PDF document text
    • https://inks.bg/userfiles/file/50355201295.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vovirokudozagux.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/87892437912.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/45260063173.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xowiwevikefe.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/16281433097.pdfIn PDF document text
    • https://yellowstonewildlife.com/99278534175.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 18068 bytes
SHA-256: 684ae1fbeed36bd537c0a5074b50fc30dd6b25a0be1e97a0016a5060575b85de
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 10508 bytes
SHA-256: 980e8005e8146a72d37baacba6779fe9f7d3c7935f6c5c739d4c7bf74cd4222c

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