Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e391084e8f5e28…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 20:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 924a2f0c4283feab22fe3618d9d59399 SHA-1: a9e4d2c7450eaf186a40abca5ab3cffdb28e79d9 SHA-256: 83e391084e8f5e2815eeff6fb0d80f1a9fbb6246676f84bf0ef438f6da757aab
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains a link farm pointing to compromised WordPress upload directories, which likely serve as a redirection mechanism to a final malicious payload. While no scripts were directly extracted, the nature of the link farm suggests it is designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5e988725d---23793527135.pdf In PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/24595295284.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/706c75fc24145fa9fd03f0c48f2223d4/jaruzinoridixogajap.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210802_A054B6528BC8CD6D.pdfIn PDF document text
    • http://bulmarconsult.com/files/2834331807.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/54312510732.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kexuwigipikud.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3db0c8d10---74819239314.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/ximojazebupoxaveveburas.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/kumijubusunasorimaxok.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4b316d2cdeb713f81d4119d66b66cc0b/75788498359.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/gamikuvemekabusen.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/kunedo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a56c3bbec---kikaj.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/76007755755.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/prvk6u25934gsvi739doqrq2ed/1486316169.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608445cfee920---60961971696.pdfIn PDF document text
    • https://ancoraeducacion.com/images/15817098728.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5917512f6daee4e28b1360f1d4d192c.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xebaxijaladegizasadofuwa.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/gonefaf.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/67794707685.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e544c99ab---61764600419.pdfIn PDF document text
    • http://scpt.it/userfiles/files/zawememotidarusavev.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rofebokozeje.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/29643822811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tata+mcgraw+hill+books+for+upsc+pdf+free+downloadPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 11448 bytes
SHA-256: d8addf4a97070bfa475e3e395b8b44c311367089fe98ca57184daeb212d43dee
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 17352 bytes
SHA-256: ae23372b59ff28937d08b59913c659374bf8196238d8ff4fe0dbe38913c75469

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