Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939315abaede5ff…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 08:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 175bb18d6a42915d686d87763d87e870 SHA-1: 4b5fe3effd3cee7dba42a7f7121da7e485b942e8 SHA-256: a939315abaede5ffac72c7b7dbdd34835366753d5f2b76d42a103cfd659bfd5e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to manipulate search engine rankings or track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://geredekombiservisi.com/userfiles/file/41458083493.pdf In PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/67781051320.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/24375080642.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921afe4b74---mujibedugunivala.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/35327157124.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/40948189340.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353eab95321---pedudajapajokabukigarixef.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bukepovugukazi.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_084612.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/wobalunanoserulobakosemu.pdfIn PDF document text
    • http://seamacros.com/upload/file/sirobiwewuga.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98e3c5f4b---33643066796.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/76335889231.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4af3c7c6a---37015615750.pdfIn PDF document text
    • http://baove247.org/upload/files/lavasisap.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/15767043429.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vuzinifomo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/9392213581.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210909120259.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/88b616acfcd4aa8149a1badc63980eba/92995422811.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pajatesupelagagazovigime.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/vibipatamikaropakuwodu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/25266066528.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jetolexed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=coin+master+unlimited+coinsPDF link annotation
    • 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 18188 bytes
SHA-256: 01638e86fc3c580ce0c94967de4275cc5ea0e2e74bc46a2b31284d65afa505b1
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10664 bytes
SHA-256: 66a8fccc0b3f5a6201189bb2b054ca1b6dcb127493d001a9fb2e9bf58604d6ac
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.