Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75045b89d33a016…

MALICIOUS

PDF

80.6 KB Created: 2021-10-08 01:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0bc28a141ab105b2e197e61aeb74c9bb SHA-1: 452625dc5b8dd00b19ae43bd9b09382a016d2639 SHA-256: f75045b89d33a016508f9de6a70c88e93e48bd4ad87a5c28c306d031104db0d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many hosted on potentially compromised WordPress sites, suggesting an attempt to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/83032d2be6491beacae589a4707a503c/bunisimofezosezu.pdf In PDF document text
    • https://fulzugaskozpont.hu/files/87794775519.pdfIn PDF document text
    • http://www.agot.pl/upload/file/54094623095.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210919052348.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/jobuzu.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/pulutarapuvi.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69563476041.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/14355773245.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/53407745582.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e32e7d78b7---71639364417.pdfIn PDF document text
    • https://best-label.com/upload/files/lowodotuni.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/10879197563.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ac40bd334f98421a2b39dbe5b0c06bb3/95241663872.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20210928045416.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/45048531144.pdfIn PDF document text
    • http://watch62.ru/files/files/movapekevufamedamifi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021913214719279.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615c234a66c40---wiruvodezefujiweri.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/pokafopetogobedamumab.pdfIn PDF document text
    • http://ukrfirework.com/images/file/32199127773.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/lipuxuvevidopototitasixas.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/19327872943.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/41573429471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+break+your+anklePDF 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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 19464 bytes
SHA-256: 6d3c620acf762935b407f3f9a736f616aed3b1903446e7b59cdb67554b18125a
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 10220 bytes
SHA-256: 63e09185082487787ec8abcf7c57fe6f896a599da4f863ca206dbf4c91ef5bba
font_02_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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