Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f77351a86b44a0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 18:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85c298e135063d9520645e405b5f2c8e SHA-1: 50f9e280dc72f6159882065d2c7a103cadc80ca5 SHA-256: 19f77351a86b44a0bd9dfb95af5692199d958ecd45152d9861eba0019d5f9e23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=wifi+hacking+apps+that+actually+work PDF link annotation
    • http://crabandclaw.com/uploads/files/560911594.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/56851696870.pdfIn PDF document text
    • http://emannsltd.com/userfiles/82343452782.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/bonegexusufixak.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fukebuxegoriwogati.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/5224153392.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/60569814822.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/96694412380.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/43125045640.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/36833322699.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/48229221460.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342f539eb2---58352661706.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/85716541536.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/gekorubu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jesobepumanoletusewepuxe.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/21315843337.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zilexa.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/98520786859.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/76347126812.pdfPDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4057721bb---lodubuwukiritiv.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/fatanuxutewefakudoj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p13i3sn7vudbn5n3vrri0i1qg4/6555210316.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/velesupi.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bizutusisideti.pdfIn PDF document text
    • 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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 11012 bytes
SHA-256: 767ce0ebc97415e7f3129c630b88620f854c7abb460ffb53ddf189b76a5a7d18
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 14820 bytes
SHA-256: 6f5f86352da531c517b149313f79b5cbc18fd4d9b40aa4b956520026c3a02220
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1