Malicious PDF — malware analysis report

Static analysis result for SHA-256 394b674f5720aa01…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 15:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 678eb833bf3d76a89bba4af2af11ed6f SHA-1: d2354ad63d039a9c19e848a1030d3385212942b4 SHA-256: 394b674f5720aa018a9b2aeb3cabcf2e71fddef45adcdae2ced73033a3ea4482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8ca5c397c093d1da01feacf6df42e629/menanegogatevipesugeruk.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3caf4ac8f9---64564725906.pdfIn PDF document text
    • https://zestus.us/admin/images/file/soxodipipe.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/gozolevapedakibanikule.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7b14b3837c738bb35c3d2f96b1bcf475/gagilozapuxitu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/75974595225.pdfIn PDF document text
    • http://tms-operation.com/upload/files/87709111071.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/kululovosiwebuselotifazog.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b30cnpse3uu1qf73u5mr027gg7/93243083363.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ip2usp4cuu5tdpdjmqvlgu5cj2/sadevex.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/67478615553.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6481b1a861fb86fc304038d77a0bc624/lolofuweruv.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7fad3d3114853d690a4342debd3276d4/wikiju.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/43146540544.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf3c3ba70---72169551446.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/79912417922.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/decd9c24643b06655ae4f5fc347b9941/56561498667.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/46064977759.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/nozemevidupozebezenikadat.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/witusaluxoruviniwe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nejivugopigoguvojuvag.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530004838.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gelotipepi.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/jopagujok.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/bekavalolinujuzoxedutovor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=music+artist+bio+template+pdfPDF 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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 17316 bytes
SHA-256: c84ebc28dd14049e8342983bc1dfa7a144191e4d020b9e7681d8d019b083af0d
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 10912 bytes
SHA-256: 8f3470cabb1194286370719b880c3edfdf81cefc1436402bae4ba73f9e640db0