Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59f667178d23448…

MALICIOUS

PDF

86.7 KB Created: 2021-08-30 01:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4afad425c7c4cfcc1d877eb591cf9437 SHA-1: e8f6283a89410eb79ddde1b2846b1f52d97f18c8 SHA-256: d59f667178d23448357c2a82f631694a9a22af0f156f2d9ef478857f9d1cfd16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://nomylo.ru/uplcv?utm_term=car+industry+tycoon PDF link annotation
    • http://martonelektro.hu/files/file/lawonikigetoru.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/66868938903.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4ae4c812---48440966540.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/20360533706.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006d3bb2a3---10181179079.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/86340994259.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626400923.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d37686569db---tuxoxizowegarabevazibikud.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099fde988795---15728775638.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vedakarepatafe.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/zutawebuw.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikutu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/patasafamafujudetimapobu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be95b7b87e---94427085561.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/pinubolagelozadajeneseka.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/595e641840a195b036c57a0a3ede6f8f/27236362546.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/tupipejejigaxeg.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vorov.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/58550127856.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2799f0e2---gojamixuzogamukamifad.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/mezelituwenerexixifede.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060112023795.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/21325003574.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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 19152 bytes
SHA-256: 3e4c21f16a37bdaca56302222783399bd553625bd2a461674e8ddfebd2523096
font_01_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10432 bytes
SHA-256: b58dcf8eaadfc09a585df672c6aea4c3ae39cd30600f9904c993f0ad49a915fb
font_02_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1