Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb79113dc5b5c1b0…

MALICIOUS

PDF

94.3 KB Created: 2021-09-12 05:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46b281c6934428f1f2699904f3d3344e SHA-1: 064a889c4159e1889d215b25a28040c735e8082b SHA-256: eb79113dc5b5c1b015974359ba7e7f925e8369ec9318e1cdf26aead49dfec97e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba2175ae8---13684476575.pdf In PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/28686330379.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/salupe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bb4d975aa872ef11a79b626441093d18/36687613806.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/mosig.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/25914203048.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/vezixutaxowasoxal.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/soriwu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/55451018026.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/58756547309.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/12735384211.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/66261298699.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sawekizawuxaza.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/meragudanofenuginejad.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/70634703172.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/13165560435.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f039815bc---76023001442.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fesopusipaxugiwuxu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/9718490183.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bemaxugasapujufotad.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/selumoxuginekemerofego.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/mujidisali.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/70370528218.pdfIn PDF document text
    • http://labotinnghia.com/img/files/23447248768.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f921f3a06b---60405476288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convertir+pdf+en+epub+androidPDF 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_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10616 bytes
SHA-256: 7f93ac4260a717f13aae3ea5d09be1980a4ed88a010f6815fafc506a9c9b3409
font_02_sfnt_off00013742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 20588 bytes
SHA-256: ecc0f557bfdbc53b8bbe9361a26e971756ce3a955f80f0f9d54f56c0b828ef50

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