Malicious PDF — malware analysis report

Static analysis result for SHA-256 836abc60cd6f659e…

MALICIOUS

PDF

77.6 KB Created: 2021-10-10 15:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bbfee2135f045bb8318886abad8664c SHA-1: 4c90d444522ce9a3747d7b9da3fc52901dce04ea SHA-256: 836abc60cd6f659ea254fbb75fc215b723e047e657f782546516c0dae032cbb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c06dd717b913c81c55f4728dd3e21c17/43075565327.pdf In PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/1993140675.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/81259227882.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/giwewegaluguladukevo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3gi2mu85qd8iotq2ni9fa3a2d3/xukarunerefanumepaniw.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/54432499926.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/26036712528.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/juromaluze.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/1626329206.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26589723908.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/64394058182.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/62496716720.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54805415360.pdfIn PDF document text
    • https://titishop.co/upload/files/zemufuwi.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/gotugefaxonunigabipo.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/koxiwijun.pdfIn PDF document text
    • http://xycrusher.com/d/files/39250367989.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b0b132badbfd10c5015384c9b0950c70/xazimikegebetamakujuw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bf83dade---bozizegofido.pdfIn PDF document text
    • https://tonitomov.com/picture/file/59231628993.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/tuxurowutorevevefare.pdfIn PDF document text
    • http://lachina.cn/upload/file/ripazapotuwekin.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/27961365371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fifa+14+torrent+download+pc+full+versionPDF 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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10972 bytes
SHA-256: 2e6f2411bbe88a6ffa5ed4184f230ba5343d1b208503c2c61e5d073b26174754
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 17968 bytes
SHA-256: 2e470c33286d5a950ab4ced5daccd1867a5c3dff3fce401097ba5148871d3747
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1