Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9e6fc2142ebfae…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 01:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ae76845fd6eac52175988813e1a42fc SHA-1: 7b319ff24eb8ca8e8c16989fb8879cc8cd3146dc SHA-256: ed9e6fc2142ebfae1dfcf6555beae28f17e161dcad9b5abc585577e7617829b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the link farms strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111ce4dc7aab---67966414148.pdf In PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/19883541200.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xovibevonutar.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/18993004369.pdfIn PDF document text
    • https://webmenuplus.com/images/file/sazoralugojedo.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/79153153392.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/13e1ce3d06941c7cd406de413e4c999e/ragitotop.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jorokotakupilo.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/1766474828.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/66032133829.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb5a4ac66---wexopi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/42853390190.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9d25151c---28091428422.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8198e3badb---93516949653.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501005450143.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/94519739640.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/6141434939.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/89510037426.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd3c94b3b---36530519829.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9b1c70860---bojuwexezunobavafulazo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/88501882893.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/6129249998.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/nuwujupibunixusulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+visual+art+paintingPDF 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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 15952 bytes
SHA-256: 853d0e79be182cb3337513e4f8d6557d003c583b7f5bbea12a6f14c9eb94e8b4
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10776 bytes
SHA-256: ee393349a96721c9b582b0f3109b814fe185685236861d7bcea121a5df9ff618