Malicious PDF — malware analysis report

Static analysis result for SHA-256 674116dd6b892c75…

MALICIOUS

PDF

82.9 KB Created: 2021-08-30 04:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a42cd08b82247769c6bccd5fca8e9f05 SHA-1: f61fad126a3fcbf1e504486d538969cfaf5df221 SHA-256: 674116dd6b892c756e62d41ca71611e2288f82fb30760372970ef73f43078d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=8+ball+pool+mod+guideline PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/134134f2952d9430a4ccef2ae1a8120b/wefeboda.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/26386810742.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/17309449555.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/47246640230.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jewevamaw.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/zijilolijijafisozumeril.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/faponiwalatovudom.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/matejagasutedaditan.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210717_173536.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/76977794589.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932ec31614---janolukudewaku.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/samoxaf.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/romeridex.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/semenetigure.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1030cc329381352e706bd7d388f2aba8/lojebedutowukiwudosesav.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086d58b8fe86---xikezik.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927a446bbc0---98993828790.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kl39c730qr0thns5cg5dqelcg6/40812432913.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/77805312846.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608695095c3a7---pasowi.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/babufedexejo.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/53062072735.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c04f76599b4ebeabaaceb72d9aa02653/82635881537.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pv92p5rsjj628p80iit7e25o2b/47901981157.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 17368 bytes
SHA-256: 0e529f5d9185fd50d3c701147df32969875de8ddaf0d6c754ab668174c77b023
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 10720 bytes
SHA-256: e74aa56c1fdcffe615dc887c35de2ab3fb37d8f57ea278d61cff00e67ccf5d10
font_02_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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