Malicious PDF — malware analysis report

Static analysis result for SHA-256 2994a2e4b101dfe0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 02:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a6873292e2fb548c04364093942509b SHA-1: ab3e6b7ccf4bbf6f63488d302e624544980507ef SHA-256: 2994a2e4b101dfe086ca4c1b0718ff148697ff013301f8e71d6bf5fecc5218f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://oroblupiscine.it/userfiles/files/damez.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sijibumeviweb.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a33158b79b6172e719d93ac817e986f/59606169874.pdf
    • http://poetische-malerei.de/web/editor/files/wuxeb.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wesipegewexijesivese.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a591f04d73605e8e044e4553fcd0f85/pafowilobejuxodajutu.pdf
    • http://princeverma.in/uploads/files/48305306342.pdf
    • https://asiquim.com/ckfinder/userfiles/files/wifugululudopedi.pdf
    • http://bluecars.pl/userfiles/file/ridoxilekul.pdf
    • http://form4concrete.ru/pics/cont/file/nedujuban.pdf
    • http://fioredda.com/userfiles/files/xabuwebuwer.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/xobagumitonoxakijosokago.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/xulomukumatosebemewir.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/74390507821.pdf
    • https://tresonance.org/uploadfiles/37931330281.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2ttecvupr6k1e5p3squkgo5502/24036921455.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/bumuvidovunoxofov.pdf
    • http://kbidc.kr/upload/editor/file/1631946910.pdf
    • https://samajsutra.com/userfiles/files/xotonifozake.pdf
    • http://viswinkelindex.nl/images/uploads/bomifi.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/41797160379.pdf
    • https://presentkompaniet.com/img/content/file/16164166579.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+game+booster+for+android+free+fire
    • 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_off0000edaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
font_01_sfnt_off000105c6.bin
ce5ed293b6162efadfb93a2eede79d309f3ec9766fdad15977698da84e3f001c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10844 bytes
font_02_sfnt_off00011e9c.bin
d24ae5c07377f1fedfecc133e1ec0103659f514e4f3b219ce9746d16af50397e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 17320 bytes