Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0441256de4de89…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 16:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f6c8aca085cbc5c321e62e6304df9b5 SHA-1: 049077bb2b74b97c8986132ed47bc18c96fde804 SHA-256: cd0441256de4de89efe2114b742a7a0a4467ce245f20a7e973847e6e06658f16
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload or intent beyond the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://watosaphotography.com/app/webroot/userfiles/files/20210902_174725.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/lesunapovefifemafune.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/87233058543.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/75326608653.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/89943085892.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/1795783997.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/34390164649.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092804172576.pdfIn PDF document text
    • http://husplaza.hu/editor_up/91754116746.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/lazeremexupesosaginaw.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/64027689501.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/14123390756.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/laxaxelomigexetiki.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/96968968016.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/31174092069.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b351d1d943---riwutesenonosifavezotilo.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/8200522000.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/112649068.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/30157504377.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/48839268601.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/16366665980.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dbe5532d7d1e1600f49f1d4e82fdd356/gasovid.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35723574060.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/940632d92674f0c60540d2bf1d37fbdd/nejakeme.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/gititotasibakotuje.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/21936323997.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/366210938.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/95001143142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=1990+best+picture+nomineesPDF 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 extracted file (font_00_sfnt_off0000b402.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000b402.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 10812 bytes
SHA-256: c312de413280621f313634ee77287313992c3b6fea1cdcf562ca8df2bbb3f6c8
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 15560 bytes
SHA-256: d8da64378edfdcefb874fd5cf8dc9c000569835faa8aaf46f04dd5913d74172e
font_02_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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