Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc595dd6c2119ba…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 03:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a781e2890890b619378e95439d513ab5 SHA-1: 8c3a03c7eaa216cf534f8202019722c162d6da7e SHA-256: 5bc595dd6c2119ba3237bb24c361eae4f69c86492db7e29a8d71c1f9cd5797df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised or disposable sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92fb331d9---97485497225.pdf In PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pinesonulajom.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/saxorufo.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/89314311756.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/14629646940.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/44315009606.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/dff6ecab13960588768c67afc79b07c0/pufoxogugujubidonurifurub.pdfIn PDF document text
    • http://kgmda.com/upload/files/regiwosefikemajifoj.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gurinafepigaguwupefafewe.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907122133.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22957850395.pdfIn PDF document text
    • https://kimcert.net/E/file/75174949204.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/79401617837.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/diwodotulogijidimig.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/84762247118.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/18181840413.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/70338336746.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/xanifefetol.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dfee74fec---piladilibefusujokimarezow.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/bofotigudolovesumigasirix.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/xumomovipasuzovisamizoj.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vugot.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/25080736399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+stop+getting+amber+alerts+on+androidPDF 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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 10952 bytes
SHA-256: 46c58d9ce4ec6ce133fb9ab54bfe58a25f3b2951fc0b7e9c8be8a6a9dd769c4e
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 19216 bytes
SHA-256: 0982ea655758e3b97fee554a877458c8865986373f86ed53e1cf9d7cb6dbfb7a
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1