Malicious PDF — malware analysis report

Static analysis result for SHA-256 f792bb7c25c120be…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d082228a4f880caf3fa1083cb7e3cb6 SHA-1: 8d125c56931cdf5416ed92ded4f1d321029f9a75 SHA-256: f792bb7c25c120be2d67f1f90b217bd0cc1f40ef1b612470ca49ae33d9ebce01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file contains numerous embedded URLs, many of which point to external websites, including some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=crash+bandicoot+on+the+run+ios+download PDF link annotation
    • http://e-sheremet.com/img/jidisolodudipulimodepekaf.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/83794401908.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/29220709949.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/39676372131.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/38936938723.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613843110aac2---13757476995.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/rubutawufafakosaj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1593ac7b277d5fae27a6f040e9c2b6e8/doliragaduvadojawepog.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/82563037265.pdfIn PDF document text
    • https://umartravel.com/files/57984092830.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/74350595487.pdfIn PDF document text
    • http://autodilygood.cz/files/file/49689447356.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3646215473.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/xevarajoje.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/sezirosonakozifa.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7f89279a713b3a070eb9a90e40342208/kilutigixi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/11640295058.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/ligudafufuvov.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/30724117887.pdfIn PDF document text
    • https://kapefashion.com/files/files/lolerul.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/2043832243.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/86155761868.pdfIn PDF document text
    • https://mklaassen.nl/images/file/27895875063.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/72457327707.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/77226851527.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/lamipixuvumevijopotijon.pdfIn PDF document text
    • 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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 18160 bytes
SHA-256: 3a990c5b47ee715337a1ef7a933f8afef05109df0041f3d7e03929896215a6f7
font_01_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 10824 bytes
SHA-256: 5073434dcd70472be65db65d0f06f9e6518e399da9858fae2aaad76077531ac8
font_02_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1