Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33ae8d2f260d5f3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 03:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd40fb0b21aa57a2709fd86311028a94 SHA-1: c92e9b28d8fbecef0cbb4c9614f07691935d6a88 SHA-256: d33ae8d2f260d5f317edaef84fe228a5018783e9547363403c2460481a023af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=structural+analysis+hibbeler+10th PDF link annotation
    • https://vadihosting.com/calisma2/files/uploads/juvivipefudebugelo.pdfIn PDF document text
    • https://www.znackakvality.info/files/16511985431.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/poninipugujafutasematoza.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/55640576546.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/50193807687.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gikike.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/174af14f0baea9458e1e51d373092cdf/xumezema.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/94733915188.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/62401796898.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/xaneledabin.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96691849951.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a96852731f2da56658561c0aa77644b/titepusozef.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/vinisenowepebosutusi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ad86da66---pawawo.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/dotoliwatogu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42796624757.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/82453678158.pdfIn PDF document text
    • https://domilot.com/uploader/files/76006154206.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/lemovunubenuladebizuw.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gozapadagot.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/81424974913.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/4946660264.pdfIn PDF document text
    • https://steammining.com/userfiles/file/dusazevolub.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-03-19-26-91.pdfIn PDF document text
    • 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_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 10812 bytes
SHA-256: 9dd32c0a2912fae3add6e7c2b9ce9975b672f66571db4cdede89f896f8e360fb
font_01_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16884 bytes
SHA-256: e7f454127567c0a0b59d488011ddbe4a05497253951d7769836a026f67d772da

Open this report in the interactive analyzer, or submit your own file for analysis.