Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd1f44b5a63d43f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 14:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcf24b641f925c9722be76873fb750b3 SHA-1: dc9b32d3c1344a6e04ffd5f8958daa3ceb9722bc SHA-256: acd1f44b5a63d43f268013ed3206c143feb782387d0a76222eff8ac2488bbe85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into downloading fake software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://irlanc.ru/uplcv?utm_term=windows+10+iso+free+download+32+bit
    • https://almuhja.ps/ckfinder/userfiles/files/48355913391.pdf
    • http://chiaranannini.com/userfiles/files/fijitijakepokerizubogu.pdf
    • http://thesei.com/
    • https://binarbaid.com/public_html/userfiles/file/35455647975.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xavilulozetisora.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/wexekijuwuvejupowapupisul.pdf
    • http://unseretochter.ch/images/file/71331888605.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r635ne0jikc9p50uub0v6066v7/niwitok.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/57435452700.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/32f094e4f701079f4dfe8a96866cc66a/vimotirebujividawofofuso.pdf
    • http://c-six.it/userfiles/files/2348284937.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/95833060022.pdf
    • https://erdenet.mn/userfiles/file/50561374861.pdf
    • https://dalton-english.com/userfiles/file/vuwerobimat.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kinuzabifafixerodi.pdf
    • https://zegaoyun.com/calisma2/files/uploads/77047649305.pdf
    • https://spacio.hk/attachment/file/wejagiwajebunuxi.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210918_71EEDC58784E5C72.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8651a355e---xinisetivemuf.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/gexusaga.pdf
    • http://www.anclupnapoli.it/userfiles/file/vilixazutofibimujobopasas.pdf
    • http://zagazzo.com/userfiles/file/pusoge.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142520558d66---wadaw.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/65840455839.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/57578756413.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/xazazowemowozaz.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_off0000b5ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 16792 bytes
font_01_sfnt_off0000cde0.bin
3d266439a07732b0ab40ddf7f54343a9e84b783c702ad48da9196a65cd24feb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 15012 bytes
font_02_sfnt_off0000f3b3.bin
4a2321094f8d8290cbd60e8e392bdfd07be9568ed417dddde199ed0b62a0a2ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 11032 bytes