Malicious PDF — malware analysis report

Static analysis result for SHA-256 894c6bc170e14b83…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 11:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f8918b54b53ac2f1d60c59c2a6605f9 SHA-1: 46fbacd8ee2d399b378c434c0001390c88104dca SHA-256: 894c6bc170e14b830e5ac7ff938d0e1b1cec2d29962e7c1ff5e3e058db9d3ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://axwelindia.com/uploads/63437553963.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a322c2311ea920a8415e987f3b56c0c2/lilonavefifogekepuvozat.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/88326484497.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/54044588123.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/54157786022.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/29598818520.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/mipexuzewox.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/nezuzelasabo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/60389086552.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210811124922.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qhr5ugjepvt69vilrunos8qlj4/68906098341.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15493913631.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7601ee02---55039647611.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kazunajirawakikaloro.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097950e2a950---zirozumemotaguwudafodef.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/52871238305.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/38348492690.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/padilujegimelajif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/306015eea2b56cfb5e4cdc194d9f3013/nowuweza.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/55159660821.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8cab5524c572596e34c50c28ab353171/58141696006.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/97329592355.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/50049997698.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9b8d6048---30934704555.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104748e59a83---70300333458.pdfIn PDF document text
    • https://codecs.ro/images/file/wakibak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=read+crescendo+online+free+pdfPDF 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18084 bytes
SHA-256: 980c52e88ae9ab83ac8423c283071a9e7b8cd1e15fde56e9c97b90ea6aa6497a
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360A 10560 bytes
SHA-256: 0b51913d6b621375564551ea93305f4eea619f9a0b3fccd211c8a9282dd75e03