Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbcd786a9ec9704…

MALICIOUS

PDF

95.4 KB Created: 2021-08-20 02:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19f72ddf415579a5a920c71516cee59c SHA-1: 724f343a033f541078150f4b135e754b7f7bd52d SHA-256: 8fbcd786a9ec9704db2363ff7169174586b65f751eb469ee3ba42f2d89ea1d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs indicates an attempt to direct users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=how+to+type+euro+symbol+on+chromebook PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8115689b4b---dozozulenixiwesijopim.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/19964211656.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/dovutatatosememepobun.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/isp2rn1h52ugl7ho40qu6c4099/kidom.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f199a5251f---bepezusureleri.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/496e84cb5467a7a41981aa9ccb11b537/rabufukef.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fc88c79283e2c8950cffb2caa742092b/73907553261.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/81771496708.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kixaziwasejefibedobaduzu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077d32b47929---16994967500.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee090fddb07---5364500453.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/19460900692.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/daruvubitajoj.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/purafawemanupo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vabowemibupisufaso.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611e028d7e82e---zamidavimovumi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7be46d85637493a19dd39a8e75718621/lubudi.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/teguwamezibidoxomoxulumi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/459f7be12c8312f6a97b2dd4bac988d5/maguwilaga.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc751d9538---96482304222.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39805192723.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kemuwuwanoreruxarafuwix.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202108191312071440.pdfIn PDF document text
    • http://effektfilm.de/files/file/sanurojedozetexoxi.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 34836 bytes
SHA-256: a9a2cfe15b5911f6a47d31fa4e5774088bbdc98c03f69bb59e682b00d1bf2bd7
font_01_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 10908 bytes
SHA-256: fa516ed2b6e625209eb08065c637c7f6d688f8b1b6877e1a9773c3767936a61b

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