Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b29ceb8be8f4f8…

MALICIOUS

PDF

148.3 KB Created: 2021-08-01 13:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42e9c8969de65abe114c0b7eed45dd21 SHA-1: 1a4167a26c50e159b72d359026a3dae9d4041f2a SHA-256: 39b29ceb8be8f4f8dee3fb713d31b7501ae3caa2b20cff2855f85c4687400b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing pages or download further malware. The presence of embedded URLs and the link farm structure suggest an attempt to exploit SEO or user trust to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=oyun+d%C3%B6nemi+ruh+sa%C4%9Fl%C4%B1%C4%9F%C4%B1+ve+hastal%C4%B1klar%C4%B1+kitab%C4%B1 PDF link annotation
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/iacdghve7nt5pkv9kk4mo255l1/tewetegobolaximokanupu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab88aac73---8861084479.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pegukinamizolelilimi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wesimezapezuzerovumazema.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/farigotanitumotuvatug.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/73502874099.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/zuzemupi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6275755de---8559625592.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/kofafun.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/74527187311.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/mewiwuxap.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/vipalagijida.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/34130722141.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3284f17e---zatef.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4b644758---dufilofinafotaxe.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0abbddd1b---77218900895.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/56056115312.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/53494955260.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b4a8621fa8605097129a65aaf625fdf8/68648162272.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/583f56e7f71053bb50007a9e7b88b158/misofevanososiwuxubovum.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/ravun.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f2175680a---71520607406.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acffe59817---lewatameze.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_off0001dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD43 11424 bytes
SHA-256: 8e107bc334911563a5ea43d50ed453ff9d12c44171459c9813906312d4f73c48
font_01_sfnt_off0001f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FDA 19672 bytes
SHA-256: f03cb5273cd44bba7108f4bbe82f67339515f419bdc37672e94390afd2d7149c

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