Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba86c4dea6c92737…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 23:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d01e653597abf35635b4f592da34882c SHA-1: 373fa689da882e4c569e1f22f4552ca07cf58503 SHA-256: ba86c4dea6c92737db4b0e85f87d3e5f057d773a57f8a690858da8e0ec002505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links serving as a lure for users to download further payloads. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12321eab3---85724802655.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fedb6086dc7d7e0518d78bfab42e0e1e/88254177215.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ndleg61ass0fpir383rr4gnuij/xodozi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca815aac5b---94513464345.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9148378b76---wadufib.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/66503088703.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/34580660204.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c43ae18800c05079ad84a241ca6e990e/bipubalitimupipixolum.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/luvemowat.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb94b7b16---71692518206.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1365526041f751ca8cf9ac71a526d5ed/47741484946.pdfIn PDF document text
    • https://chp-travel.ir/data/file/73959070241.pdfIn PDF document text
    • http://charivne.info/images/file/34209060999.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/leleporilezurixug.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e217a9b8acd---tokeferifunajevumurerofi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607604610c401---torotuwutizabinad.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c2e5349f59f436ecdc70028898dcb707/kixejurigujerafubo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606edc225f6a6---limek.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d39a9bda99d---27840094806.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62db00b3---zolaturigubugaxalujuz.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/78361104470.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee9e63b09---2567958218.pdfIn PDF document text
    • http://axwelindia.com/uploads/66939963420.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/50349688857.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0ae1cd0549ff178c27cb5196a5f5d8cd/posijobovebafufazizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=letter+to+give+permission+to+act+on+my+behalfPDF 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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 11204 bytes
SHA-256: 260fa0f1901b0f5e4ac5f3b9ceac0787bebca3f998192f1271c06a68a9f1ee52
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 17192 bytes
SHA-256: d8ba0c8de905a79e0ef2dc9ae9702bb9af16cb3af5cb934b91759394f64d73d0