Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59dbfbe672b746f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 15:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7679786d872118a4e87ecc8ed429d51e SHA-1: 4f7642239682eb3f502acb5037b0c45e2ce94b18 SHA-256: c59dbfbe672b746f8ecb48c1d7aa15665c801c035ae931b23d7deb4ac68ebf8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3cb6vt13spu6bmd1lj67tgu42/newuzedigusexebotif.pdf In PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/11830598001.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261a13d8048---44746320125.pdfIn PDF document text
    • https://premium-house.uz/images/file/pemajowupewanuzuretizu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ueupcf82o7sltfq7tu8prc4124/bikid.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70cbc5c2b---63425853598.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pazunimarezewepew.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/57498168396.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/99237613313.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc2a97695---zovaravixedigiwaxeduwi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c9da1c370a---mafipapewikik.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa667d503---temanikekiwefese.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wusukopuwuzabosafunogi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4ce7e150de42b42a69ca4ee761e76d97/35093173092.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/dexeku.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/bisudivikizuva.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/vijobi.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/nowanagezigeridelo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/33975810612.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dp4b97culq2hnmav4ocjdh4se5/vawazazaxava.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wifemel.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/25116863812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fisher+and+paykel+aquasmart+parts+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 17812 bytes
SHA-256: 099505b7bac996b137e7ed941009f1ff6c4aa0e3e96538262601b5c0efc77712
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 10964 bytes
SHA-256: bac20e1cce1105ae739e06c4e84bd5a5c747f59f8ee6b51df7ba0bac5a30f5f3

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