Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a29be36d1d8307c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d4e5a000ce589319b5ff0bc1d4dc7a3 SHA-1: a2d022da378a3e7f055341f630952d04b45e625c SHA-256: 9a29be36d1d8307c3ea80527da7c25372ded22ed80c1ae4bb0d996deb3540c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. This suggests a multi-stage attack designed to obscure the ultimate destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/33lrqg4va2jhnrkmo1beg70g6v/57304908806.pdf In PDF document text
    • http://baovethanglongmb.com/upload/files/xurukiwetugasaj.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/34026765039.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/29340626222.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mafopuwofefamujosijep.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/vuronibuv.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/rabapewe.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/985585de2d7f5c91095663153ed1ae7a/43411697859.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a48293b866e0ad6650642df36005bc6/zutevexewaxupe.pdfIn PDF document text
    • http://jiab.net/userData/board/file/pekivoveviwikabegupebesas.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/54522137087.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/76649136802.pdfIn PDF document text
    • http://cssh.es/img/file/redimanow.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/24686612479.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0eb0u52cqik2f46cl5fptmgc65/tovogejexulaga.pdfIn PDF document text
    • https://ijpdua.com/contents/files/46352527287.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/75230197981.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e080436c2---kudivozijejebudasonusad.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/sufarutoxezesiniwexow.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/12398969961.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/75598836966.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fovipiruruxosigufivobat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sky+high+full+movie+onlinePDF 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_off0000bd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD05 20728 bytes
SHA-256: 64d4fd82f8028bafd1ae34d566425f29f1fbcda82a0e662b0675413f99601152
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10580 bytes
SHA-256: 46202049976e15781cd57fcef046daa3b253aa87042e1dbbbdf7c5427fc09de7
font_02_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1