Malicious PDF — malware analysis report

Static analysis result for SHA-256 813ab19d6351b718…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 19:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 198c16c403e42d6b815c5ec1b9cd7b65 SHA-1: 8bcc39a4220bcce160779b3d6b2c9f5ed0b20227 SHA-256: 813ab19d6351b718182b3822c3577b2536a79ff4634e11296cff83a6b42c2deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/geduvokil.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d1521fd783675dde03fc739102e2492c/13541236949.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/vdudcsdqjf0gq8im6oqbk69j6e/ruzebowukavof.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/21b5b367a02a4316013e84e5dd430ab2/suraw.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a2e06c645e978ea589e11ab2804cef6/24914932480.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/91485092352.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a984328ed---89166519363.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/16654352755.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/2368254413.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/84ca9863995decfd97a6bb59cc5e3839/texaperivezarefitutewox.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/gimotuge.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/rupisabujivaguxube.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qsp2s6sq259dr7nsc5gq971jt3/30196949683.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/gixepexew.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/94183343381.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/61229668139.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/77386024644.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a44a4076c6593c458596478ddeb4f776/25352960310.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8a217afe---29352541761.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcbb5fb18---319358003.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/mevotokagulegelagejemip.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988201d0039---pejemafusedusolup.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/kupovawetetozu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/22077902204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+transition+words+and+phrasesPDF 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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 10592 bytes
SHA-256: 3b63332d05e197eea36444a0010998821468b9e0f82e9f68ff1227c4de7b66e1
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 17216 bytes
SHA-256: 02644cba68584a6f197a9d9194da8aae848daa711bb2a6aa714be337eb7c5095

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