Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bd9cb4dca16afe…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 09:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7de19b201390f14772e0bb808a0ff5c0 SHA-1: 8ab83d3e3f6442a4435570ac22fe8289d34093f6 SHA-256: e0bd9cb4dca16afe04b587f010814359234867fe964cd50b13d3ab219802abc2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cructi.ru/uplcv?utm_term=pokemon+ruby+online+randomizer
    • http://drivescuolaguida.it/userfiles/files/buzukowonuxawalofunejaji.pdf
    • http://ikuma-car.com/js/upload/files/88921415699.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xewakuborekadop.pdf
    • http://techscreening.com/userfiles/files/18893483759.pdf
    • http://magogaralbamoble.com/galeria/files/kilekanojuribepokoxem.pdf
    • http://www.abitacolointerni.it/newsletter/file/nifabakerupebebimuxap.pdf
    • http://bebsulmare.com/userfiles/files/rikagitedozozuvujasenur.pdf
    • http://asijskepotraviny.cz/files/file/xoboposelupubiz.pdf
    • http://fitsiluet.cz/data/file/jovilur.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/92997132214.pdf
    • http://studioferrato.it/userfiles/files/66010738323.pdf
    • http://gruppocreta.com/userfiles/files/gigadenivelovo.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa4f760c1---jaxig.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/divozurifuxedobudo.pdf
    • https://sunarchegypt.com/userfiles/file/10243970836.pdf
    • https://bistakalikotenetwork.com/userfiles/file/93461080600.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195c7e499---jumakudoroboxipixowevob.pdf
    • http://newabel.com/ckfinder/userfiles/files/nodip.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/bu1pjqkijnlrse22jbdcmdj1di/bitaki.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/58296141219.pdf
    • http://www.hgbehringer.de/img/files/files/duxuwutiwinutudebig.pdf
    • http://bubb.cn/up_file/file/23186482488.pdf
    • http://amandatour.ru/js/ckfinder/userfile
    • 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_off0000b3c7.bin
7add9300d79fde4fd420cf65c449a3858aae72dfb32326a0cd5647f665c6c1ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 10648 bytes
font_01_sfnt_off0000cc1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 16792 bytes
font_02_sfnt_off0000e431.bin
047c31d8cd10c8f45bbe95dd6eba897a3dc8970877c702465a5a9d2413d089ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 17704 bytes