Malicious PDF — malware analysis report

Static analysis result for SHA-256 94543fcdc4fc994c…

MALICIOUS

PDF

77.0 KB Created: 2021-07-16 01:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad94555569361733733ee1ab32595f1f SHA-1: c13180b128c3e1fea2de1394893fd7f8695207b5 SHA-256: 94543fcdc4fc994c4861561497d37f9a792603d6e66e41e2301f46bfebe743ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=lil+dicky+professional+rapper
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sh4l7elfb5a9uunjsnh31jgmfr/93836328669.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff50fe7ae9---90448793283.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bd1a800b748130d21e4092bc2dee22f6/67799903510.pdf
    • http://xboxheerlen.nl/userfiles/file/75857243892.pdf
    • http://goldenteriyaki.com/uploads/files/48504247264.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0937de3822---xajuru.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8a2cd6b6---mawajelunobov.pdf
    • https://protrialse.eu/files/files/58363929217.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/83097858887.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a93b2236a---bewavogulewipinejubu.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013c63c479---vovigezimobukuzen.pdf
    • https://giustofiori.it/file/rosuliz.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b78346e23b681a6b09cbc186b1401d87/naxagibavanenakubamevobi.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ae089f965083f0e6ecfdc11612a0ed3/wogubodurokununidi.pdf
    • https://nnkcreations.com/userfiles/file/mepobofo.pdf
    • https://clubsportedinburgh.org/userfiles/files/8849013822.pdf
    • http://sanidom.pl/img/file/wadumizupevezegunixote.pdf
    • http://hrt-foto.hu/_user/file/68709570636.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8821628726098841b8edd8.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08bf658992---14609512412.pdf
    • http://engineersclasses4competition.com/files/others/difewiponoko.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/wiregaloseluvekapanibiwe.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kc34f5jht8n3gl0v0u68as7gud/21194233481.pdf
    • https://prosperitas.be/data/assets/file/nejanerotege.pdf
    • https://vayamcs.com/content_files/files/26280143447.pdf
    • https://ratsimae.ee/media/contents/file/69955796730.pdf
    • 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_off0000c7c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 16792 bytes
font_01_sfnt_off0000dfdb.bin
1873564c467216f076d82308c5a6778e42b13d8c66788f0752b2c6faa0c0d152
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10676 bytes
font_02_sfnt_off0000f860.bin
f57d81b032d0b7ed95bf4c470954e98a27914a99307545ddf8f8b074a44c0eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 17696 bytes