Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8672c85f2aeb2c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 11:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36169ea38df7c486976985506fde7a80 SHA-1: 1cd17d504e482fec7a5820e4381f602a6565fa03 SHA-256: ad8672c85f2aeb2c16412838100be2deee9367a20b6a69b3aa0988c3d6e3a5f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external sites hosted on compromised CMS platforms or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the redirection of users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://absolutelyneon.com/userfiles/file/18892163406.pdf In PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/zamugoxoxemupugume.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/nalugapuposet.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d9697d31b2286831b7bdb20bf40da616/11386713155.pdfIn PDF document text
    • https://drlanda.hu/user/file/nepagirag.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/wikok.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zukef.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072f45930d20---6426991209.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8e0d1d0a---kotabirajaxab.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835088c5771---56875266985.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125db7110805---33122776312.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55647121563.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/71026753077.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/15865060108.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f2gfdrap4sptvh6pd3c1fcgl0c/xulubujorinajokodeg.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/raxeboleremiguwixewig.pdfIn PDF document text
    • http://markone-tools.com/upload/files/57176336303.pdfIn PDF document text
    • http://goldmustang.com/files/files/jisegef.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609160640636a---nozaranojekogirojo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/6636327139.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/99305318434.pdfIn PDF document text
    • http://btfa.tw/upload/files/94207008478.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/befiromivikewiti.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/48134474312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=11th+science+biology+book+in+gujarati+pdf+2018+ncertPDF 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_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 11880 bytes
SHA-256: b74240a5129ad2d78e401a725569ce9f701c021c518d429ce234068cd2d17a66
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 18220 bytes
SHA-256: 7cc262ae0f2c68ff9943fe2b2f5ecfd2c029f3ab240db9422814bf7ec54e9893
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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