Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b8ab1a5a05e212…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 03:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eeb8746be8f5590f07961cb72763ed10 SHA-1: 404aa51b4734014169f2b7d728735e53d5288f53 SHA-256: 19b8ab1a5a05e212b0fd21f50e8f9c013c372ead373a88607a610f6cf9d43bf7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The document contains numerous URLs pointing to PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303feee5ff9---bajuwizurimifavesevaje.pdf In PDF document text
    • http://warmistore.com/userfiles/file/diwugek.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zimibopobi.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/rapiwalekupadaruginofot.pdfIn PDF document text
    • https://asi-filter.pl/files/file/kedizupes.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76cb7bc99---kekonizafozoxezu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/84766330325.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wokiwome.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/9604911659.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/94797836916.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/43835085737.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/42005657204.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902165630.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161438d9cd2165---67046155482.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/lunegofale.pdfIn PDF document text
    • http://newo.ru/files/files/79684151380.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e39a97e---37998749355.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/sazaralusenafex.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/49742951384.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4990004547.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96347625959.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+free+n64+emulator+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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10916 bytes
SHA-256: 492151e3216facf0b750a956da88c5bafd2119e7944d76bc78daa4b98cb0221f
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 17396 bytes
SHA-256: 8c3484ba01ba05f25faca7a23685a484779343ef7096eca7436f016383d7c19d