Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f92585fa1f7e612…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 01:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7a7ea860f5100395c372d463fb98581 SHA-1: 9ca69b771e75dbc44eee068669fddcf7c2a7e477 SHA-256: 3f92585fa1f7e612e3fba3e85a68562cc9f3edc2a03c6307d4765210061e76cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://manavpublicschool.org/manav/userfiles/file/35171447957.pdf In PDF document text
    • http://ombs.ru/uploads/files/gitepinufuda.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/63944635844.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gojetawesisovome.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/32v75e0lnd99s5n3865uu99rrs/poloruladugolobedukulo.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/lobirejevugedugerap.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210703051059.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/60767153137.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/29969856224.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/57639952463.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5df139061---zifamijiguguwuzoriwokusiv.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jemcridj10vn6a1eg0f7ocr57v/46362055879.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/69731391434.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zibobipadusasugajolerux.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f395a355---67403665574.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/33204848302.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/25572550818.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/dijadusimadejulutiriv.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/9598771042.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/44402993168.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fd07f4da---kawexeruvavegof.pdfPDF link annotation
    • http://silver.jo/ckfinder/blanc/files/bovuleleduvumatari.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/98945499072.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ad9hhr0401uosjqsch7gcragu8/pokonubolevodijepanazobi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/924270b75134b16222f6b4ee8338eb5d/16583647106.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdc8ac0469---39613067283.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/kenazorebogedifoparesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=burette+digital+brand+titrette+manualPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10596 bytes
SHA-256: a0e886e250cfdbd452ad4b196bd6e268451b49e7aa361d227385f9bcd5ca47bd
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 20112 bytes
SHA-256: 0b3256364ce66f5c459e5e83356151e42040a800d7a59366efb0829aef7a7e27
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1