Malicious PDF — malware analysis report

Static analysis result for SHA-256 b930196212f4f957…

MALICIOUS

PDF

112.6 KB Created: 2021-07-06 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb58ff753e138ac66a617626687bb7e2 SHA-1: e2ddb881ba006a78332e9daeeba18968d86fffa4 SHA-256: b930196212f4f9573ff8784d1b9bf455ad98aba2a9dadf909ee0e2cc115c0588
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4fc34051d---gizawiwa.pdf In PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/38520987313.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/90085043014.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/37915295277.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/34eb418190ce0358bd524c68768ef1f4/22390013707.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087d82cf79---robuxume.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa752829aee---51402271352.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fmtr3p8rp7agldldji5ilj86v8/jekegapane.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/23592059853.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d02e2819c---rulasolifowobufefufaxe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c37730f88ed4c640b082adfaa1dee00d/16666178949.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afc90b4fd---59101852204.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/db095c696547cde658b71efc3d29a8c5/vubaxiluboxivutu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e524db1dead2ae8dba623c9ba1eaa045/95446555934.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/be3917014f3d02e68643f6e39ea15020/gebovijejigegakinifula.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdc81269b---62942157697.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987eace1b63---robesu.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/64781086459.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/36625439929.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/45382756974.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/l52eqf23atvsul34ov6dsk00rv/80537509209.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fozelujevoned.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea83b03bd---56296386636.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/62120277662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=premature+baby+care+in+hospitalPDF 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_off000154ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AC 10992 bytes
SHA-256: 33b7322c45ff02fa5e9d374a17015eb0361515c9db934111b2b5b56f9d8dce21
font_01_sfnt_off00016dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000185ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185EA 18040 bytes
SHA-256: f25db2c2a27e930293d9848eeecbb4cfb4612122aeec00860d805802e0ccbee4