Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37d4108b6373fc7…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 16:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1abca1779cbd013c3ba1a2e2c71a9cd1 SHA-1: 991dc9fb21c949cf89622fb4fb4ff015fd71c223 SHA-256: d37d4108b6373fc74491cf7b14f0e84f5d7bd9597b5aedc207b1c104e1453c28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://robvancampen.nl/userfiles/file/92680735213.pdf In PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_3665BC7C3B91422F.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1736ddef6387a592f51bf8f731f44952/lunapumeparemavakoj.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/piloxovifuradufe.pdfIn PDF document text
    • http://ud2-140.com/files/27624839892.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d36d8b58---75392979715.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/bimetonuboravibologex.pdfIn PDF document text
    • http://sql110.com/pic/26492311475.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kixitugezobelozusonade.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/6292369396.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/mebazaxobatewavedubo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b904c54732---48968015022.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb12843496---jufefemunulozesola.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4uk7ig2ncc425t40m66pavbs54/jikusamuxexus.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/29307178204.pdfIn PDF document text
    • http://immopolignano.lu/images/61332490702.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/xigojepun.pdfIn PDF document text
    • http://contua.org/userfiles/file/80300848163.pdfIn PDF document text
    • http://fitviewer.com/files/file/roxofojaminegozoteburuf.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/sawusexatelojonutumigam.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/98261947616.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/158997388.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/50245941436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=whatscan+for+whatsapp+web+pro+apk+downloadPDF 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_off0000aceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 10936 bytes
SHA-256: a07acbe193a7c9cac2a509bf52476176dc91525e957d1119cd2aca39c79ca6c0
font_02_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 14740 bytes
SHA-256: 11b396da05cf576ed36d255a0c23a195f4b8718e07142912acf183d61784c271

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