Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3479480abdced5c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 18:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9920df0b1f4a5cc3344d86bc8388f181 SHA-1: 08ab7b5b1736a188d9bca2225372d37e46a2822e SHA-256: f3479480abdced5c1fd6e90d2858136c4b0d72cd37c204826702a3907b80c6a7
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to various domains. The PDF document's structure and the presence of multiple links suggest an attempt to lure users to potentially malicious websites, possibly for phishing or to download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=how+to+hack+wifi+with+android PDF link annotation
    • https://mediaget.ru/userfiles/files/49071753508.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/69908184029.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/71454615223.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/jibojugedafiwelivifosutel.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/60684281028.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f42cd4d7441aaed6c55271a80b0f4d3/13425019217.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/77909563827.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivuduzuvi.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/82488103039.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50c980e15cc93369fdb95512bd5da967/nomefagizawuwovusefevipej.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3c96cb8e---tiwosimipi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139278c38d32---kozazavisirotumenegubasa.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/23917040878.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/larosipijuxonodupera.pdfIn PDF document text
    • http://wigs4less.net/nbloom/fckuploads/file/bodevabufo.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/likudexoxiwonelopiximus.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210916095129_1dsdmg.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kezarowatomu.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/11634353827.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110516216772.pdfIn PDF document text
    • http://fpole.ru/sadm_files/samamezulel.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/luwidaravezaremawaletefa.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/53245432328.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10396 bytes
SHA-256: 9c0b5fa518cc6dda908c02acc3860b3914bbf2844a97deb9edbea40ae893c322