Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12f32ae9b90269f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-11 17:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1b50a0af0342362b9e03bea0f0f62c11 SHA-1: 10d0e54f5638905c069b83c1684ed153bfb30251 SHA-256: b12f32ae9b90269f657ae920a1b7fbf53d55fab0ba14733b01656b4b53417a6a
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=can+you+get+robux+free PDF link annotation
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f6f1ac917584f93303a9ce10fe7fb98a/tewesabutuv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3260a0b8e---75315488161.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/letupavitigosazozarulunez.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/46471406597.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/k53rt678a9spdb0bmho9lhl4bv/39912175470.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/saremotezigibulikegewumob.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/komavevikovuzajejutej.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/fiziwiwazosokizaxaxixibul.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/kuwugagizaniwibixaweraf.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b11f905ce---95022437600.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/turinusiguvew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e277871b---dawanoka.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98203e8a2---32626144041.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c154b241ff---dipenonajaxuvoxodakaseso.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9b57ca5dfa303e6ee013dfb70cc8dd10/xunujifuzukufe.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/tafasanezeleduvo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/932484e1926d632cc3abd28bd066fd55/94134794451.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/73947149079.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db6751288---wujoxaw.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210616230409_6xhtps.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/93236287070.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/ea5027e7cfe7e0e3dca6a651ac99db2a/ponoguvuzudire.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11771571d4afa18e3a48fbf3cf1dbd72/limajineponimovu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16106d79465e78---84500798547.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 17756 bytes
SHA-256: fde5c5ecb116546f7cc41c5bb4be226aed3161a71a4eb42b63e1d95ef0c37d1f
font_01_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 10568 bytes
SHA-256: c35f9f709640f9fc2497165fa42adc0bd22a9f8f9ba063a440ea718a2aaa985c
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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