Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bec7c3faff3045…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 02:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57f2df0feffe9fc42fe9f87249e17e56 SHA-1: bccc3f0d2f789a660e0d1bf5a92952242110e393 SHA-256: 92bec7c3faff304538929723efb1edebfb97f9757ad979ed063f241bf3e5d193
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1ef64d47---31632143264.pdf In PDF document text
    • https://ixiu-23.com/uploads/files/202109120521388551.pdfIn PDF document text
    • http://gespk.com/userfiles/file/dosupegeku.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jototigopolobojogotad.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/57585962220.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/55212185515.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/fexumelekerejezasigomoxeb.pdfIn PDF document text
    • http://tercovci.cz/files/file/mibezedamixagi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/6701226888.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/vukadupajofibijixane.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/linugow.pdfIn PDF document text
    • http://www.grifin.sk/files/82536305511.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe17d8b56---38570674609.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210915152730049.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2719267868.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gerezoxegepajosumegovax.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/25565269320.pdfIn PDF document text
    • https://epiphanych.com/images/file/vapujexokumogusuneru.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f783deccae---geguxefavalipigoguwif.pdfIn PDF document text
    • https://path.mn/userfiles/files/37456679647.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/88395548040.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05e85b05d---luximadoxoludikun.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130848c1604d---zetakusam.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/ledomoletefadumum.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0fec3f969---neparagawerexotubaka.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/gumumano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+activate+hotspot+on+androidPDF 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_off0000c187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 16856 bytes
SHA-256: 6dde193cf05ac904ab4345dee69ce9d94d2ae46071789baeb6d47986ad4a394a
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10708 bytes
SHA-256: 6d7511447c5182320ae50da63a1466a716f34ebee2ecc1d7bf3e3989e0e03081

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