Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08ef79c296cb47f…

MALICIOUS

PDF

102.0 KB Created: 2021-09-04 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e86e593bb54592a43b4686387e18496 SHA-1: 33e616c7c314515f6168683db10cf3274aab26fb SHA-256: b08ef79c296cb47fa78c7fb2569a08c7cfef08ac748849e69cef9110ec8b5d99
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://cnex.cc/images/blog//file/vizimobuzoseganomegawa.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/visamivoponabigubetur.pdfIn PDF document text
    • https://dcimx.com/files/35616514452.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c714ce9130c---vewusejide.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/50978597862.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/25820135985.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaede808cfb---94601086661.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dipoparexanupaba.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/gazavakidatoze.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/38215568809.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611396fb85be8---bitegodisakadupuzategez.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D93B73C9AC5.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/nabemim.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ae895a6e11d087d14efe594a26e8443/kewuvomowit.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/71634969530.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/21134042819.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/lunakunasulumuva.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/99680117838.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/xavazevubevovabedukas.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/81205332085.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139e7d546b---gekewenegixuna.pdfIn PDF document text
    • http://kleiberit.ru/files/file/99388357055.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/29116319026.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/41775976730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=anticuerpos+diabetes+tipo+1+pdfPDF 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_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 18532 bytes
SHA-256: f0c3c154c069702c360abea9c7eb515e53081195bd8b90e4b2b07d9f813479af
font_01_sfnt_off000158f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001710d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710D 10840 bytes
SHA-256: 3741dc0a7af772c1455d45da154a469175f018479d58301956329232438fc87d

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