Malicious PDF — malware analysis report

Static analysis result for SHA-256 488c17d8fd6d0367…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 06:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98885fa3dbf8b57429b4a712055507f5 SHA-1: bcd8ae39aec956c5372338f6f057939e5fb0dffd SHA-256: 488c17d8fd6d03678f0144a9dfaa06a03fda683e2331fb867e51519e79adcfd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=emulador+de+juegos+android+para+pc
    • http://toyotaprius-custom.com/js/upload/files/leniru.pdf
    • https://studyhalltracker.com/files/file/28216163627.pdf
    • https://ratsimae.ee/media/contents/file/puxosezisoginipo.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/gusufudukiwuwakelaxi.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/foxudun.pdf
    • http://elistaprezentow.pl/userfiles/file/62036179260.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161372d773e041---98257256126.pdf
    • http://domplus.su/userfiles/files/78025671363.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b3c06348fca311854fcd9ee790ff7bf1/lijelizu.pdf
    • http://acudrved.com/ckfinder/userfiles/files/rawojeten.pdf
    • http://www.klimavill.com/data/editorfile/felipawudejibuzowaz.pdf
    • http://stlnsk.ru/uploads/file/visaxogogujixe.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/18321194023.pdf
    • https://accounting789.com/ThImg/file/82472010744.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/35851988377.pdf
    • http://kompassztuki.pl/Image/files/lubowemibebu.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/859be9da4b6a449e78285e81a4ea1290/lidipe.pdf
    • https://la-klamm.org/Files/files/madofutamizokuxotebonit.pdf
    • http://em-mould.com/ckfinder/userfiles/files/77482783985.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5vlfmqrv00h28oco9484glr4ef/54887500176.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614191fc3bf10---77033292790.pdf
    • http://bsinteriordesigner.com/userfiles/files/xomoxejuzo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7670ba22---71234228366.pdf
    • http://huichem.com/ckfinder/userfiles/files/soromupizone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d775.bin
29e1676bc4e2475dbb514e76284ac1cf1e37fec4bbeb4a296567b072d7d0a51d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 19332 bytes
font_01_sfnt_off00010870.bin
74478fd2df24703f2ad436ff5a933d04ea7ab67a9a4e26d8f945b8ff71b47262
pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 10972 bytes
font_02_sfnt_off0001218f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes