Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ed8cd21f488e7c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb317dd29b2533fff8d6f24402d93d6 SHA-1: 14f535a400f833deff04f1e5ec02fc5fd9d76269 SHA-256: 92ed8cd21f488e7cdff15bd8dd617872d1484ea017136f694f814cbe837aa771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links indicates an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=cocoa+price+today
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0013522a---239609882.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2nsk5psid6ui3ph1qir245dteh/xekozofefemipimaru.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3b4b56d4059c6cf6942436bc99373e8a/rovixafida.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/potamawobo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b725b1c8627---madimakov.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611115208617c---dapabuwumuditit.pdf
    • http://www.bash.cl/media/file/debizuwogepemalelon.pdf
    • http://cochemical.com/upload/files/51585514772.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/wevisanumiwufuxeridu.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610422b331587---banasifitup.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210831_C4451BC2E9B0C4EA.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/jalopimetirigejonas.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8695dc0c367ab1f4bad1093c5b58b2da/55767328709.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e37fc35e0f3dd816b74ec4f14d147582/lajejotarixitofat.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d3178db---famipebujekalep.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d485f82d50e---besobeponetubi.pdf
    • http://kibbkw.com/uploads/files/66578329971.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b3718c7a---75319007700.pdf
    • http://cnmrobotics.com/files/files/18721211394.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9dbe44af1118c12ac868bbfce1cbc622/15834414553.pdf
    • https://pet-fashion.ro/mm/file/selowosidisov.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7fba00b6fb2769d73b5a758c937eab53/18882191578.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4967dd03c---95877246157.pdf
    • http://tranindo.com/Uploads/userfiles/files/62172016836.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin
9ad35e4ee79fc02e4d8c68b4823e1681262a45895d04f4a76809eb7be732c049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 19000 bytes
font_01_sfnt_off00011aba.bin
74425b2016ee027dd95689db1f7d2a3a34e4fc2dbe8d93a8ba8fc45a54aa81b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 10332 bytes
font_02_sfnt_off00013235.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 16792 bytes

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