Malicious PDF — malware analysis report

Static analysis result for SHA-256 134d01f08d096690…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 08:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df25b765fe06d97f35846cc4685a92e4 SHA-1: 6d9b9244893db6e18108049ed55755df48e226cf SHA-256: 134d01f08d0966903fc4323854182f8990aa962732572822f78914cc780ffa54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites, some of which are hosted on disposable domains or use UTM parameters for tracking. The presence of external URI links and link farm patterns suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://synerhu.ru/uplcv?utm_term=madalin+stunt+cars+2+unblocked+games PDF link annotation
    • http://wagnerpc.com/userfiles/files/dilijosijemomimutazud.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/44121578425.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/58748903068.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/tufadegidebibabinugozu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/15434883347.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/sozudalur.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kebopavimejunavin.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/28583338763.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbc300f59---dagetukol.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/82166ab421ece97add0214553d10a987.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/lemazejadapotujejurisanev.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/42288317203.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/gebixekerikodebarenalazid.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/dokovew.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/61204482405.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64ca7da52---wesasazogelosabak.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/69433454729.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/75706591517.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/dabumofexopitu.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210919111901.pdfIn PDF document text
    • https://kawanmto.com/contents/files/tufeworageji.pdfIn PDF document text
    • http://spiregene.com/image/files/20210921_020805.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/129b92e3dc9451579aae08cc80720e82/70688779499.pdfIn PDF document text
    • http://fohow77.ru/upload/file/funokiwamejaroxelilewoxol.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/waxor.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/zoragovufodilokimuz.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 19040 bytes
SHA-256: 67736f8be9433210cdbfbedf918058db77b22f776762c458c634eda700a587cd
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 11160 bytes
SHA-256: 60804ecbc56696c37aa6b2cca0b5d8d03a7c2865d13cbd7ef39d0cf358468be2
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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