Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef3bce1fb1b5acb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 09:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af0ac0e15a9da3bdfed6a63a3662bc7a SHA-1: 0884c57de3c46e47cdc1d3f294b1d5e458e0133d SHA-256: 7ef3bce1fb1b5acb537e99af4a240f6d45c5a73166bf21c52ed2fd273fb42ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to download further malicious payloads, potentially exploiting users through phishing or other social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18ebd2610---zoduvopilonubiribalomux.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/pizevesugixekalowuwejoki.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613983ee64472---dokajidoxekaw.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/xofibanujarubevukoxe.pdfIn PDF document text
    • http://8njl.com/userfiles/files/fodojevuwakun.pdfIn PDF document text
    • http://chinazzjx.com/d/files/gagife.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7dccdb2cd3f631cbbdb676aeecd005a5/wavibakudagawunine.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c3e7a360---zatigojegab.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/40169750532.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/benenegagosepulinezupiw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a4r2ilpun27mq20lscnnidksq1/91898427517.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5bb703a7---vaxugonilegejizurupi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0a4ed300---91703810946.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dopiwumotan.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/52942699198.pdfIn PDF document text
    • https://e-room.co/userfiles/file/zebevejokax.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/witunogokepumimo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343de60253f---771888908.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/pagiledub.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • http://candientushinko.com/images/file/xemixeriluj.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/31195452703.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/5218862169.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/86999671958.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/pasijikaleziwewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=usb+loader+gx+wii+uPDF 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_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 10656 bytes
SHA-256: 906fe282a7a67c7c015536e3ef37e87f0e3d4c1884bad2867a8f17c4e262a529
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 17512 bytes
SHA-256: f1be4aa955b8d5482a6e9dae5713af19c92d34ebd7a3f6bf22d569b72c23a942
font_02_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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