Malicious PDF — malware analysis report

Static analysis result for SHA-256 a121c91b7a2663d5…

MALICIOUS

PDF

77.3 KB Created: 2021-07-19 17:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f3262d2c3fe89f7c77983378dfa4a73 SHA-1: 195c0062501cb7c97a0fd78db5272a6817fe0fc8 SHA-256: a121c91b7a2663d56ee104aada7bb9f28fcedad29722c4b3ae7f564e07bcd651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7513c5420d5d22c2672ee1b9ba39feeb/falesasebipulawesegalo.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v0j3me3j45i49guc0bmokhe7h7/90378426443.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l1kp3pjfp3rqvpc3lkbteuehuo/wigusupetategitaniw.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/lukebek.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa65d1606---mijufapewog.pdfIn PDF document text
    • http://adveotec.com/img/file/migubuxogirasobu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fupgmti9u9171a8bn7re00vc73/78800038408.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/rulumij.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/63395863212.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/rezab.pdfIn PDF document text
    • https://landi-bg.com/images/file/64447329761.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952aeeb7c4---gakubemaxeduvetokawiven.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/topagitumemigosemojit.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ru0huod0nc2gpcf28g0vlrhqu3/veliwixiba.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56d63bfdd---nekunewiroz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33dda4fc6---zagafedo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/50504408123.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nowetubobaxuxibo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hc2835qgh743t18t3uegqt23fc/64493304042.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73768bd376---zevosufe.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/bipudigiru.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2773b0b7---11389210035.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e74adf270---77530464079.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9ddaf6f3---fawuge.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/32406443290.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/4020641379.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607095c94a8de---12637424574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=icao+airport+codes+list+pdfPDF 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_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 10460 bytes
SHA-256: 3641ac36fb19efd72b089d9c58f0aa52fa925acd502b319be9bd5d97649f145e
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 16140 bytes
SHA-256: 25d3b85e0cf5651d418d3aaee475340b2ecd7806a7e96b3a133f0f3364b3a194