Malicious PDF — malware analysis report

Static analysis result for SHA-256 d249bb47a613ab40…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec04002c68ef4b01e38123ebfbe58450 SHA-1: bcfa0fd1c786a92bf2b8e19aa0544b2c8ea404a9 SHA-256: d249bb47a613ab4026941a6d9a16be5c04754fb5ae9b74877c3ad0a556a08375
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abofahed.com/userfiles/file/visogirumoxidetasupajas.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/07f185af8d67631d1eeff174e338bcb9/laduduwun.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/50104176609.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f8da158f3953bc238927aadb21604f88/remuwuf.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dae4287302f9a1203cc38735adf09816/xeluvalamatapaxipupebi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3e8d4151---sitomapemadijidovol.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/86816046429.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/73949588903.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/591805339.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5eb38b9aa16ecb3941d7e643dc0a4f8/doleluwonawilonisifaxa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ee1ce92d---dasinosukok.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/85931939085.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/sabilefogegala.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7b85f12d396274e74494b00f954e883f/juguboma.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d64a96ee---91418189051.pdfIn PDF document text
    • http://chipgene.com/image/files/20210824_222859.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/31123733314.pdfIn PDF document text
    • http://yilip.net/userData/board/file/zefixi.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/mitefefapewivifipazijinur.pdfIn PDF document text
    • http://mebco.ru/images/file/xelajapukevi.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/dojisivubafefew.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/50191556892.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa001d787---ganajagunetapulad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=reflection+or+refraction+worksheetPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/55437883015.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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 17772 bytes
SHA-256: 2ecbc918455081a8db806ae7a476ab5146fc373d401caf0760cd78074d5e6f9e
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10656 bytes
SHA-256: 5307d8c7fbd28c4477382645c58aa1156836176ca095e92d4a1b08ac810b50ef
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1