Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0c0dd0f6c2860b…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e66d8b72adc9ad4c4d13c0bc515e68d6 SHA-1: 94f6c621bf4513795ca0949705bdd20b5b600f10 SHA-256: ce0c0dd0f6c2860bb64e236af32628ed76ca4b2e44aaae7bd8baefb1cc1e87f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. While no scripts were explicitly extracted, the presence of external links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://allytemp.ru/uplcv?utm_term=necromunda+underhive+pdf+espa%C3%B1ol PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9bcd4ef20c03707406cfaa0f4b0b1135/letuxikaligixiponu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/39838925855.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1dbc3cdb357d7acc8b516aef9c3092c0/98300521558.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16123c421450eb---wujisunomizilisa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/88615774696.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/susuxadepakepowolikub.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/e4921585a51246d069815aacfea92973/88788258452.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/wawebonogafomesubituxu.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210705161732.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/lozevajugob.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8aec84aa---pamulepelorenulexerosit.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210703131201_fi99g0.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/33217182072.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb214aa39---31670360538.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e0be22164fd06eab964f42338fb7eff/1612366611.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a96521d265f---lujusidijivujafobukusosi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161141bef353d4---kofilugotivel.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64112517306.pdfIn PDF document text
    • https://egca.fr/userfiles/file/13126616324.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/46591086893.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2fbk04ds5folt32i4jeaoaddc2/24920913347.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/75681887466.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/94552105119.pdfIn PDF document text
    • https://area5srl.it/file/vipunogizowovitusu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37b809915---rujav.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b04a9c946f---61220377515.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160763df227cb0---kogozibi.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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 11136 bytes
SHA-256: 752d8ee1cbe6ee0e349b138122002eb887c29f415f80e28e63b22ae09b9fb27c
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 18752 bytes
SHA-256: 1d03d250c299bfb6957780040796b6cc13fb97248101c4ed0dcd52d3a5a2e373

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