Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa501279c853f61…

MALICIOUS

PDF

82.7 KB Created: 2021-07-17 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebad0286e7eeb1613f77d7ce1d1d3666 SHA-1: 93fdd48214342fc83b6b96f2090d5a5f898cf16f SHA-256: 4fa501279c853f61e0fe959a1b81a1f26537cfd53e5b8b313669c806faac2240
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://livre-art.com/ckfinder/userfiles/files/bijamozi.pdf In PDF document text
    • http://bdn10.cz/files/file/16290978335.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kuwenasidosivo.pdfIn PDF document text
    • http://ktcz.eu/files/files/51889406293.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/nagiwoxapilekabevapuso.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/121ca8ff561316d261328d8be21b911f/girofamag.pdfIn PDF document text
    • https://unosms.us/userfiles/file/ripalidaridobakexowalu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c96b69a91---gepofu.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4d959a06e544aa759af8e14cf4f3a992/rujapo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1545bb0616---81989819933.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608895b269be4---69401899280.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/64117d71a0da28781027b71a8fd27e34/70178778619.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/58296186525.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6r3g2guknu37macf6j9ospcfjq/16267252792.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/91193971755.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/97340885425.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vasul.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/3354079856.pdfIn PDF document text
    • http://charivne.info/images/file/34402286942.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nifogonerulatawosezut.pdfIn PDF document text
    • https://kenadong.com/contents//files/tolubaganibodalaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kevin+hastings+refereePDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17404 bytes
SHA-256: b79419270d4fd801c7f8f9bc85b172629a0f28821892bbf48ceaa7cde3417eb8
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 10384 bytes
SHA-256: 341f042c5e8707e13889db004e34777a62cdbec9281632b9a2f55d050a366b7e

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