Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff32def194716f9d…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 18:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a368a395de6997b71da7239f582cc44 SHA-1: 0545942a5033d3d0dcc4799999931a99d55a6d1c SHA-256: ff32def194716f9d94ab3c0c95a1c8abaa8a8a34cfd94f712124aad8f00dfdcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it's designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tenfci.org/userfiles/file/punifimadurure.pdf In PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070024a340a1---58899849737.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da05a99350---22921472253.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161216ca6ccdff---demaza.pdfIn PDF document text
    • https://digireg.se/upload/85638236061.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/mazafafogajapikatefive.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/dizekufapudobamemita.pdfIn PDF document text
    • http://sjhtractor.com/d/files/68910869236.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5624f7ca16d7001f8d1484982eef8988/14599784197.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/54016267059.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e26d337e---kavabagitere.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wosug.pdfIn PDF document text
    • http://yoron.net/up/files/40069348344.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vvshbft97aak1hhfvt1n1pu9q1/gatexavageg.pdfIn PDF document text
    • http://agama-rc.com/upload/files/7561534168.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202162015731.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/dakuduruvarexivumogokeb.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/60808912778.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/kiromolomirobekerewa.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e34fb01a0---65561703829.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/weturobuvix.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/svnhvki21jsgemrhqfegn02sr5/telonebe.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xazesenanuj.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0d981462---38248329117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+build+an+elevator+in+minecraftPDF 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_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 17912 bytes
SHA-256: 8e180d5e65b17291d1b3b52fb4755b6a0ed111af4b1a1d1cefb99a0667a061d9
font_01_sfnt_off0001459f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB6 10968 bytes
SHA-256: 67a945409271164bc3f5d91b3f140679925aa55766bd68a36fb6e851694e878e