Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e458e1206c342…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e79a22378e23626259ab57b76ca06b18 SHA-1: 8e70a8d65049be1c10f390749eeed9438ab597d4 SHA-256: 633e458e1206c342b76555b397325b899c621a118bbc3b02afd0b4cff36d28bb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, some pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of a 'download button' lure further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+to+see+private+profile+in+instagram
    • https://searchkar.com/ci/userfiles/files/rodalopilovitizob.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/75715555529.pdf
    • http://tiyuchangdi.com/upload_files/files/20210907_011551.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614272026cb42---negegakovulogaso.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/46180176437.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jokelabolul.pdf
    • http://csc0535.com/userfiles/file/20210901050558_jwge3g.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140a201d2c95---renotemuludoberopato.pdf
    • http://ateliergermain.club/sites/default/files/file/91057515621.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/gifezosubunuzi.pdf
    • https://tyko.pl/userfiles/file/92900492509.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/66647692025.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49431528297.pdf
    • http://k2plusinterior.com/userfiles/83891764145.pdf
    • http://basketaci.cz/UserFiles/File/27386804631.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goguxugitemexin.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nekuxobudewewokerulikuni.pdf
    • https://eravukappalpalli.com/userfiles/file/36027368825.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/71125886583.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/94975749303.pdf
    • http://ilovehikari.com/uploads/files/11549378388.pdf
    • http://skogsformedling.se/bilder_umeny/File/bufejivezob.pdf
    • http://balalajka.nu/media/lopunirezexebutebajikuz.pdf
    • http://millecolori.it/images/file/tajesiviwexikaxomamata.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61de39340---69780811953.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_off0000d744.bin
ad04476f9f02074ec131a33ffb1aa76799067d7f1e8454a2c665568a1463896c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 18400 bytes
font_01_sfnt_off00010709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16792 bytes
font_02_sfnt_off00011f20.bin
aa2b9054c5cc5bf3ff6457057f4cf9e0f136381564d5a649b20a5c5e73a199a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 10844 bytes