Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9932c0cf6c8113e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 18:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3e18a6eb9cdaa7c0733d5281630a6b4 SHA-1: 52f70b7bbabf221524ae1d94f149d71a19b7b0de SHA-256: d9932c0cf6c8113e17a4a02196675c7e2c265beb068c5ca7ad576323fbba3197
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. This indicates a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://wastran.ru/uplcv?utm_term=boboiboy+galactic+heroes+mod+apk
    • http://wuyioutdoor.com/userfiles/file/zuwixijijivutemoxox.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c94a3d8458a7b79a8c9409f4a57f3a7c/zadugakamebudarubi.pdf
    • http://w-f-l.de/user_img/file/jatibekos.pdf
    • https://maturana.cl/upload/file/47027979104.pdf
    • http://teplolux72.ru/upload/file/julib.pdf
    • http://vinczeandlaszlo.com/upload/tonobezasexonazezobuz.pdf
    • https://novinfasteners.com/userfiles/file/7735412245.pdf
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/10364229496.pdf
    • http://shipsupply.ru/userfiles/files/niwowebegez.pdf
    • https://ajitcoatings.com/uploads/fewaxogekipolapifole.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/84745634986.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/rinijemodegomimunoru.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1b8a5a2db96ed2d757f03c63b43f32a5/12012953895.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc0adafc3---73965590389.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/wujugivasagadukelapakotop.pdf
    • http://tercovci.cz/files/file/51909150508.pdf
    • https://panificioilcavaliere.it/userfiles/files/64109297283.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7246a931---12873370309.pdf
    • https://zilalcooling.com/other_files/File/67925705093.pdf
    • http://adanamega.com/userfiles/file/wusixivedul.pdf
    • http://philipsphotographystudio.com/nidukitufavebevojuze.pdf
    • https://martan.es/cenavarra_userfiles/files/rawasumugo.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139467306e54---rugijekoxonak.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/80122003689.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_off0000b024.bin
793a2253f4c310d2d69e49e043f2fe982f797f5cf6ae19d83abd3b5960ab3fc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 16844 bytes
font_01_sfnt_off0000d9e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16792 bytes
font_02_sfnt_off0000f200.bin
527749329e1f1ddb92ba2434a558197d74bfcccb588f16d388bb0c8e0509cb44
pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11256 bytes