Malicious PDF — malware analysis report

Static analysis result for SHA-256 85993bc572bec18e…

MALICIOUS

PDF

78.0 KB Created: 2021-07-18 01:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 261983ba41ee622cbdaaa84596ef51b2 SHA-1: 37cc2f22c1eeeb4c394c896e3333cb40d64b8c84 SHA-256: 85993bc572bec18e04abbfb178f819c6c28ec2d5321f92b390742039163d3112
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to various external URLs, some of which host further PDF documents. The presence of multiple compromised CMS upload links and disposable hosting indicates a pattern of distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://hzkontejnery.cz/ckfinder/userfiles/files/57420380700.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/19399792384.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f047cef3816---mekixavasaleza.pdf
    • http://beachfirebrands.com/userfiles/file/30231234980.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/titowedamisorojipowa.pdf
    • http://kistours.hu/userfiles/file/68572876077.pdf
    • http://amctop.com/board_data/editor_img/file/202105191021.pdf
    • http://wawa757.com/uploads/files/79986454838.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5fvecn5td167ouc392hknspve0/bexar.pdf
    • http://aven.su/userfiles/file/37957310880.pdf
    • http://jan-fotografie.nl/upload/files/pizuvujobekiku.pdf
    • http://wellfoto.cz/pictures/files/najitulo.pdf
    • https://araprinter.com/ckfinder/userfiles/files/sejis.pdf
    • https://aiaciran.org/cache/fck_files/file/xumetoduranekegagek.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/99099c1558c7aa6bb11e82c350f53078/20984946042.pdf
    • http://ghalemdi.com/userfiles/file/vamedokokujavazij.pdf
    • http://juha.be/_files/file/debijixu.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/putomijamavuzusivudigun.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c560a56c006---zusuwumuj.pdf
    • http://slmj8.com/data/userfiles/files/7688548790.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098126646a0d---82716450310.pdf
    • http://reneenicoleevents.com/clients/865995/File/kuturutikaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=four+picture+one+word+answers+4+letters
    • 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_off0000cd6f.bin
e6c4098a301a737915ff840226b96eeb6bb29810d1f1d0cd59b87a9f0f157b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 16924 bytes
font_01_sfnt_off0000f99b.bin
0658c43bb0cd94247ba662948ebf67aaf4e99808e7aa2fc6ad29ee2390dc35b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10748 bytes
font_02_sfnt_off0001128a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16792 bytes