Malicious PDF — malware analysis report

Static analysis result for SHA-256 616f0b51b321d3d4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 06:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe5f843da89e82679a0f857b490b732d SHA-1: a46f7c77c52cb27811518b020521818f054f52c4 SHA-256: 616f0b51b321d3d4461b355534c1a30de57885c5aea987584db2afdb14e93462
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, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=science+magazine+download+pdf PDF link annotation
    • http://smclassof57.org/clients/34860/File/50321947205.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/tokinigitinudawanoxuj.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/gobanefowesap.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kb6ldlr269op0bec3qb88r0ihv/44979625426.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/37135961164.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/82241084042.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/784771cfac78175cddf9e60dd34b28ef/79974569793.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0228a88803---83346868360.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/de430c38e56cdf471a79f8ce9af1e91c/88052818389.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da7ff62ea39---81979558810.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/xugofexabeto.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e20d578---sezebigarojubip.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607895b622f1a---vivudezobijijidozamepawa.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/guwomugowozumatuni.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99548853543.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fidasexuvexap.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/40183357248.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9205bb4281---kagesazor.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2fff4c9fb---kokizorunogowogojos.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vutibesamaw.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/donunodexi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e5c96d10---5114528619.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861ec40d36c---85528528027.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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16692 bytes
SHA-256: 72f28dadd56bc55b89ab2d60e65c52e37f5ab741d2e2ad801e1d7f87e171407b
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 10816 bytes
SHA-256: 3b64ab811c84d0680f5d0dc6f7391da36ede5f2f9a3470e6696fc8c9b074e857

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