Malicious PDF — malware analysis report

Static analysis result for SHA-256 8027c88924166f4d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 08:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c865a9a65d00ff9ef9ac1b9740361d7b SHA-1: 1bdd8f4e971ebfd4a59221a385c71b1e055e7b44 SHA-256: 8027c88924166f4d7ead10812be4de7b939c7212b796cda1a1b1eac4b0d93dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=adding+amounts+of+money+year+3+worksheet PDF link annotation
    • http://canigrup.com/userfiles/file/denakomaz.pdfIn PDF document text
    • http://armanetti.com/images/xokipowifif.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/fumizisefotoxiliresuri.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/573b8d82abb78a9fc501790122cd166b/77736915181.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c289d38c88---tibepazirerolosuwojukerux.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/degefej.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1594c3daf---wosedigapaf.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/voi76kq5urr3amrk8600jkej36/86437959537.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///63899717993.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2a5bcef0---tusotajuguxubo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/24984526024.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/6689148931.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/af270eb7b9d2312e6bacb9ccca07aa08/64221539282.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4855c22cee9f0fbc4778fedcd3d16fcb/bikogatezijimefusog.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1e6d172991d4b6a1da0e9b120608126f/72010983370.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/50737535251.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107f955a25c3---20606246043.pdfIn PDF document text
    • https://datajournonepal.org/files/ruveriragezunelinad.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/egmorint52v4f7e05n3lj42ndp/26662305972.pdfIn PDF document text
    • https://bursac.net/userfiles/file/296550504.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876ef475f10---21284003595.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/kuzenajopixi.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630040620.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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 11300 bytes
SHA-256: 9099478f5c881ebc99634fa89436747f3043d07283509dfc5b18e7506dbd0295
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 17604 bytes
SHA-256: a7505d70000a02a58f75e765360dac328dd6cae09a715ac88fb14901f2a8b38e

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