Malicious PDF — malware analysis report

Static analysis result for SHA-256 c338058905818211…

MALICIOUS

PDF

82.6 KB Created: 2021-08-28 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bab894645160a2586dc673af6bcbdbc9 SHA-1: fe6c43d85136b928bb3e9b7d1a73c84147cb28d4 SHA-256: c338058905818211d30fb7e7bc614f5d96e8cd735ea4c836e392238316d9009e
158 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited -15. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://desagresbrts.com/clients/34568/File/88123574238.pdf In PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vuzexanuxenadem.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/sipajomizifog.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/miwaden.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/gejirumedidopesogevakab.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jdgtibgqsq6531on5n4lkevf9g/25255841476.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/60af4c1f58dffb889185edfdfa499ce9/10988992683.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/betenezulijiwa.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tiwikaxigosase.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/jakofoziwus.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609df42ee56e7---famiwaxedulapozevig.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/65459031900.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/xogiwotusuvawozunir.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/95965084518.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/wugulemexojufoperavipaf.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/29404544354.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/takenevo.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/45010367880.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gibuvezitunibez.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ebae908f7---zukafarowekezibuf.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/95145503082.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7ff72b73254372754a4f5bc67d607a8b/xofezi.pdfIn PDF document text
    • http://mcutech.net/files/83147090445.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3a50fe63531cea26cb0f9104edf29dc7/nedopogapixidugeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=higher+learning+meaningPDF 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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10160 bytes
SHA-256: a2b4ef08e35e0f60b5aa36e097884dc6c8fd390c40774cc0b76435c2f9392cc6
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 19548 bytes
SHA-256: b5c8d9c672259c5a6c8675503112065f6081aa64abb3513f3f0f68fb2b15594b

Open this report in the interactive analyzer, or submit your own file for analysis.