Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02bcae06afef923…

MALICIOUS

PDF

71.4 KB Created: 2021-06-26 23:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f09cf345d768fa998d8fb1bcae370a SHA-1: a094749532253a5c5fc865af8d6b1c654eeb2bd2 SHA-256: f02bcae06afef923cd72e1978cdf5eb4346f879716b4fbb369081d110a728386
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://myredm.ru/uploads/file/vazuwuwovuvobu.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hch16nhn4scmi1eqcgl3gf0f8q/20887887501.pdf
    • http://anhbanglaw.com/userfiles/file/situwujufagebatidefa.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab521169b37---85059549579.pdf
    • https://pakistanchristiancongress.org/userfiles/file/81575074858.pdf
    • https://amd-export.com/site/upload/file/voxavaxominasum.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abad3bcc1---816336389.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/60efe3d871ce6c5f96d69faaaf7fdcaf/31065389340.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/93987ef67793082e0a734bf2b1967338/jodozula.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0fcc811473e1ec6a5db1644e5f70907e/1524248950.pdf
    • https://alatheir.com/atheirwsfiles/file/71776617973.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ee47ced84---16922483858.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a286a3b0955---33724706022.pdf
    • https://wecareu.net/ckfinder/userfiles/files/70767552065.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f0183ddebc27828539b28afddcf0d8aa/50240233938.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160943c9fbbd85---52927099914.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/173d3cf67a99d7530df76598cd2738df/fanazudepimaxudujab.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d35a63ec2---87348982805.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be32401854a---vefobalafifi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b4d0c2bd---xuripudezomusug.pdf
    • https://doktor-ara.com/userfiles/files/28574592425.pdf
    • http://alphasigmaoverseas.com/userfiles/file/xageduwukivizizikulewav.pdf
    • https://fnb-concepts.com/images/uploads/files/tikonezakugikawu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=profit+and+loss+worksheet+for+class+8+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_off0000b3ad.bin
8aa07f7f0b3cf6130a8de1bbeac9f2f048dd79a59166d1edce4665a96164f277
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 11104 bytes
font_01_sfnt_off0000cd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16792 bytes
font_02_sfnt_off0000e5ab.bin
b327fd7e42ea7506f4f61628e7bc6bde7b3bb1d9fd595dff4455ca7724cff577
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 15872 bytes