Malicious PDF — malware analysis report

Static analysis result for SHA-256 8411646c7c5811dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 06:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8b041921c67e675888b760bd0dc55b0 SHA-1: 975e85bbadf1c67e60199fc3485f3a8b7249463a SHA-256: 8411646c7c5811dc11ca7ea516a09e97393ecb59663e1aee1ae8c22c00e01a7c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/xolabutemarugatulalosurep.pdf
    • http://icbiz.ru/userfiles/file/94284716958.pdf
    • http://canadanur.com/resimler/files/zoliremagixolazo.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/28435517840.pdf
    • https://bbox.ru/images/shared/file/33879968894.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095a3c1a3f---23754758664.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jebavigixi.pdf
    • http://a-mega.ua/images/uploads/file/xituwuvozugugipufafonov.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613917a77280b---jelef.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/movopijuzekevodalabumis.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/83615187581.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/375bba386dcf02f872d238e4f88f09b8/17533921796.pdf
    • http://pkynfe.net/userfiles/file/30569928446.pdf
    • https://bdaudit.ro/userfiles/file/dirozuw.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/27304644112.pdf
    • http://skinct.com/upload_file/file/Fl202109100145425934.pdf
    • https://haysalon.com/public_html/userfiles/file/monorilenev.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/76711803396.pdf
    • http://bielle-srl.com/userfiles/files/vexexobivaxebifuxugovemo.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e058acf3---3652533180.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/dalodibasupolotowewuluw.pdf
    • https://andana.us/files/files/85341648077.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/79069877824.pdf
    • https://baigiangtoanhoc.com/upload/files/fisopajupuluxi.pdf
    • https://xosobacninh.vn/webroot/img/files/42238052912.pdf
    • https://bnbcostaverde.it/userfiles/file/dudisabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=coc+apk+obb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ba.bin
dc7a3f710302ee8b9d8ecfc404ba860b3c1e64e363c0d160e5b813c9ca7b90ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 9888 bytes
font_01_sfnt_off0000ec65.bin
b19e88de39c171d493283eeb8ef0250dda02c0b32b60b0addb4f7b236cf16677
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 17448 bytes
font_02_sfnt_off000119c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes