Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e325872cec05f2e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 292207ed0e36e869356d7dd6820b0dfb SHA-1: 6c36b3bbe27436419c5792d358ba3704093c7889 SHA-256: 6e325872cec05f2e422cd92dcd50f096efb463d3cc5434c2e41ee765b1566288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to various websites, many of which appear to be disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=vplayer+video+player PDF link annotation
    • http://www.jindatunnel.com/up_files/file/kezivusu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/64111635418.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/robumebegoruji.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/35727375921.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355e9fd8fee---59965830549.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210920014426_Nzg5MzQ4MTA1MzA=.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/meziv.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc7e3a7fc---molanadifebita.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/guline.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/23384141901.pdfIn PDF document text
    • https://kawanmto.com/contents/files/woruzivipubaketejajome.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25830419954.pdfIn PDF document text
    • http://linza-market.ru/upload/files/14286640032.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/62001107020.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/76380815499.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/gugamobakopuxajepeju.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nolegewun.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/razesawalonixobotewafigad.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/gafofisivufifonak.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/14541003837.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/zixoluletuzipaxomurudege.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149034131a66---51050423790.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/15457565734.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/90150233662.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/74036784974.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18a4619a0---38787436313.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 21068 bytes
SHA-256: b390dff18208d485e2f9a2c2cca21d43332ce5ccf207a3f15bb17d527c212925
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10164 bytes
SHA-256: 3121d3037981dc5d88aa1bf3e58fa5191853e715cd06979b0c6463fad6976cb5