Malicious PDF — malware analysis report

Static analysis result for SHA-256 585350887f3af653…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 08:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 582fa74461fed3bdd2f13bc99c3e5efa SHA-1: c80525c6e6d93edf96ab7a691b97060d50f87730 SHA-256: 585350887f3af653331b330ae76d76479208e1f26883bb2d81a659610ea31276
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bostaninsaat.com/image/files/fabit.pdf In PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/wawepedijuzefiw.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ee88d3287606f468160f3047cac10b07/wazoferuxunekexumodigawa.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/54872610064.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/49721787062.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zazivudiranus.pdfIn PDF document text
    • https://afayl.com/userfiles/file/3768094403.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/58997426502.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/34273572730.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5c41a10c---7432792408.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/87409234871.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613908ac2105c---4495884754.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fujarozugus.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/befuzelemajega.pdfIn PDF document text
    • http://mousike.it/img_ins/files/lupifusuzig.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/vefezokonebuliw.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wimoxorekelijofebifixe.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109101410597426.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/tewelujapugukazakibexalud.pdfIn PDF document text
    • https://chptravel.ir/data/file/sizakupimiloberobel.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/savosusoditu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/53960216178.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/jutaw.pdfPDF link annotation
    • https://www.seblocation.com/ckfinder/userfiles/files/35844835564.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff4e87bf58---mawulajotazexojelabulag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+cosmic+perspective+9th+edition+pdf+freePDF link annotation
    • 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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 10876 bytes
SHA-256: 0657bac726e4cc3502c6289b3273b797a7752e0c79ccbec2688e2cc48ddfdbf5
font_01_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 16696 bytes
SHA-256: 330d78f43e29dc6d6eea858340a4942a2424772fb8f0e4dcedcf49a38b7747b0
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1