Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb19284738461cb9…

MALICIOUS

PDF

87.1 KB Created: 2021-07-29 21:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71e3c0d836460924409f38a93982c13e SHA-1: 8b4f52a08d0a6c4103b9d9da3571a545fb5b3dd3 SHA-256: fb19284738461cb96ce2b4ae11457c9db20f47a77c2c5cd69f2ec0fba73a2948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0a026ec163437a399d88a10827b88b46/nixulevisokogamunomovemus.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021071005530010.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052207512146.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/zisulavibuxifigedesap.pdfIn PDF document text
    • http://cosyromania.com/media/file/96024945428.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9baa7bc9a5f4fb19b0e6e9309ee6cc4b/bafewopofapozatixodebid.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wurogedejizodawonu.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kejob.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601202923.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcd60b29f---siroseg.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160990ceb34836---jejupumogisivavako.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/35901406289.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xibib.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbbd4dc81---bivusesidexomu.pdfIn PDF document text
    • http://ranagro.com/files/87109395425.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xanixubefexabebipe.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f963a2f62bf220320b4045ceb91c3de5/70097666871.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/456be41e9f9f6451e90ebe22288a4b3b/gujufabalexudususonuxuko.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/edc0af3230507dd18a3e31e022629127/merukudasebifin.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/vojazifuziwo.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/30242875853.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/se6t4mil879o7kal071ak81ou6/4548105684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+copper+sulphate+at+homePDF 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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 18132 bytes
SHA-256: c67472d00cb239a10752435a92735f3165cbfab7a5a59adf67a47e398fa6fb25
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 10712 bytes
SHA-256: 1173e9f6ac58b0c83089ff18e8ec3b06b57b0e8e0827bf3fae36b79db84d04a5

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