Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f350cc026dd177…

MALICIOUS

PDF

88.5 KB Created: 2021-08-04 04:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041bd70231e213a5f4ad77893e42bfd4 SHA-1: 76e2b221c39cabe002a2a2052d21caed09c3aea3 SHA-256: 26f350cc026dd177092836d4771822371fa12de6ea7966493c9657994dc903bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions for accessing password-protected archives, a common tactic to bypass security filters. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting further supports this malicious intent. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=best+free+word+password+recovery+software
    • http://tcihk.com/userfiles/mojagesuruzozubezidanajur.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ddbaa800a2fc9505d1bd71b852084cf3/89876506887.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c88f131b5971f99c8d6863ae66ce0e8f/tetenarepofelazofase.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b6154dd3---rikewepujazimam.pdf
    • http://banhangcongnghe.com/upload/FCK/file/teruror.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/vomogesovelupotasonotuz.pdf
    • http://stamforgtechnologies.com/uploads/garezotawewixixipore.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a3142b4b---fefibixedazovopopetu.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/relibalotejogagitofapegaf.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/33258534900.pdf
    • http://szentimresiklos.hu/upload/file/pamikaxikeb.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0e976ece---savuwetekibawugik.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1741dfe9d---66883481748.pdf
    • https://cochleartudaskozpont.hu/files/39931225352.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747774a6190---vopupidivo.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c197aab156134e22ba657a83f6d4776/kekarez.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072d794802c8---pijuvo.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/6469830259.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8d892c016---80350371481.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/56214584413.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cqqvrfhi1m1ttsc84b9hphfp94/teludotosijimekulo.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/guf1kimkvstaavjg479641ljmo/xurelaxakibenexoma.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/aaeef4692ea4fd08a62bd29532722758/29610860497.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/4976042348.pdf
    • 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_off0000f640.bin
366855a913fb7254bc808b44c3b72fb8db1cac3b5c08a5f082d3d805f24f8001
pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10692 bytes
font_01_sfnt_off00010f0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 16792 bytes
font_02_sfnt_off0001271f.bin
aaf46603b20f711bc42f5af85869e8bdfb76907a8ab66a61b365f9c37c98f314
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 16900 bytes