Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2aa6b00c555912…

MALICIOUS

PDF

78.9 KB Created: 2021-08-12 16:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 440ae9bfff66d0247ff2725ae7112f34 SHA-1: 24629bb710fc93b237bc683d3d58457b62f41180 SHA-256: 6f2aa6b00c55591224b00ae150abe4efd8e00eb4d4b349b7a5713094fcd14e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=girl+scout+cookie+order+form+2019+printable+orange+county PDF link annotation
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/motokobigoseli.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wisamipinode.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/82204708986.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2gs06kse6e0je13dhlju2n4pq7/toxagejulogakafaloxaxige.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/22e0346c8f88b0a9c96cb99ca6b41e19/36941028971.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pemevumarodi.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/lafoxutovusubatobapoz.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/togojapimosubijuvufo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/33224932940.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/95363092854.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8585a27dea---vobasovefilob.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/gosamiwepila.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d5750f0f479dbbde5407abcd49a55554/26557236727.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/lebebolexejam.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hjkjtfpnvfmh3fheudtgt2dqm4/dukejigoravitetasuw.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/76781024477.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/55477800631.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/tovezutujulivedozitenelo.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b8e6a583d0356c9da34f5a2faab49c3e/mimekiwazikedevaguge.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5dc86545f---pajezututovewavavidim.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/bc60540c3a90bd471c9a16b99f151a02/pekimafixerupebujuda.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/bomawekafekinugodeliru.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e14518a6b---bufutigabowotab.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210610_86E21865BAAC752B.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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 17716 bytes
SHA-256: c69eecce016324a5285a1e8313b872ea52c17361595d18c100b98ca2657bf476
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 11912 bytes
SHA-256: cf820c07073ea1abcc1b4294f0563a4f432ed6a184301b414a6781bca8302c58
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1