Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a4b1bf56ae1d10…

MALICIOUS

PDF

96.1 KB Created: 2021-09-04 13:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4eb7fbcded879ae70633ef739e904e3a SHA-1: 8ecccd9e1dc6d7be48094bdc0c7f67be115071a8 SHA-256: 95a4b1bf56ae1d100ce40d85841f746cb7e043b91f54615850a9c255e453f62c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071115345b59---57957399303.pdf In PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/40914f6pk88191fc1rj066jj50/riwatogawepopis.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/pixuxavuporeboxemimupeto.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1llh4kjrve8cfntq40jea926dv/godunireloza.pdfIn PDF document text
    • https://tcremich.lu/files/files/zojosuxate.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a8bd9fc7e8d9b4eff22de4a932826da5/16851763862.pdfIn PDF document text
    • http://orem.mn/uploads/files/71210397148.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/8584419464.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/54994672762.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/korejoluwuk.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d8e3f611---99836968441.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5oeq3l3v0ogg0i9k14uhp5ia2t/garij.pdfIn PDF document text
    • http://rc-modeller.se/images/file///5652643200.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/35f3ed34894db07323ac019870726ab6/44896049939.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/fegureguvajanigo.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/tagorasegunesogonolafe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ee1bcef36143f5a086c3edb8f4efb9e6/23978472163.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/30231209153.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cbd898d88---nilepenapazapirenalisewi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607049ff2b761---nevumid.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/63682899144.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/96545951152.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50563414847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=little+sister+ses+2000+autoclave+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 10756 bytes
SHA-256: 9722b9caaf4eabd7e274e865b547fa86527d826db0866c383a6fc4ab7d886d9a
font_01_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14116 19016 bytes
SHA-256: f99465d852bfbe19bebb4a93fd7067070611a9f835013381469c04627ddeddde

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