Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8cfe5e02d0bf77…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 19:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7281cfcebdcd4d3de3eaf742d694e4da SHA-1: 89827adccc75d75c6b36009855b7b0188cccd6f4 SHA-256: cf8cfe5e02d0bf77f29d8f2ad349015e26f957d45e0520fe68935d5662924316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is used to drive traffic to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b550a86f5f703d872b50b07b7e25cb6/jugofunavuxekagizufadamom.pdf In PDF document text
    • http://amitadevnani.com/userfiles/file/89761564560.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/47d1cun9k2qprb07olhhpncusg/16152518611.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/233d5efa99b0a70387f9e465b74a55c1/zepixisimoxiguzulofub.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/78158817779.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd934cff8b---99542593896.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/dlqqj541491loks91qugg5khkb/92600143353.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lusekuvukexiliwejonuf.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/65183382671.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/vajagupebipogodeket.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/00h82v0uf9tdj2qcvvf0iq6u1r/8941683261.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6747291869f56bca16a93ccce9934048/4004618564.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/50167795206.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/korovami.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/durufuxipaxixesunid.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zobiviserulate.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/332us02lnpn053qsd7p10kasc6/71160243632.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/zovenusimibaf.pdfIn PDF document text
    • http://jar-ted.pl/file/68662026926.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/42545554377.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95951105112.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014c69f825---pigakivopiviburowad.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/306aa96ca8d3eb89be79d48ac162f650/36376822859.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6e57251515861eb564c14bc5335c5993/66410419584.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/972ad4291af9a5f2efd5253eec8d9912/24266091717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=periodic+table+with+names+and+symbols+pdfPDF 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_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 17728 bytes
SHA-256: 71925f44db947ac99c6ba6e5c39e4afc8e6d21e9a9bc3ae3a59d7c6ed278c5f3
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 11224 bytes
SHA-256: 00388c60a4a7df5939ff40e2151ae8230073239f9cf26b0f86ac5d669795d7b4