Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1b6660fa1f233…

MALICIOUS

PDF

99.0 KB Created: 2021-07-04 09:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3725d57d650f09e0da7ad33c734961e2 SHA-1: 861996ab10b6b643be4b3602abd5c5d7a10048ac SHA-256: f5b1b6660fa1f2330457f76fcd05688b79612cc288669f45c475d651f19f0823
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://brilsports.ro/userfiles/file///redijofopipudebaxu.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/46uh5m7855oai9g584673bf6k6/figege.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kapazitofelabuwape.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/niwakirirolug.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c245f8b0fe1---72755042209.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013546cda0---kikaruromoxovomojaseko.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/27986947600.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8d87b094---48683809398.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f2bc43df626f29acb63709caf4508db4/54261412286.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/matofegukufabag.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ki9f5f2d70grol5mt4vnvmn960/5912277286.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/15701867576.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3dc66f0ba---gofajodasivejelije.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011618cd77---120650846.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/88462911252.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/31b09d7774d07f80ca6e2a5de6e3c59a/ronaxiti.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2213a38edd---47447450240.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/o3c40pavcefp383sl2h4urp6bk/kerekepoxozibunij.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e4cfb8274759ea9dfe914e786d722e47/ketosuwefuwiferizusage.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/5197370626.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eee6872d3048a27c8f4af4251f911a54/35353367521.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/26721492366.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/1236008193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=about+the+evergladesPDF 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_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10620 bytes
SHA-256: 8d8fa4dd9beec7af12e487ca4efcd5371a4ba13a40fb49f634efad5b81cca5e7
font_01_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 18168 bytes
SHA-256: 54f5939d334e9b7f374ad5def1e6abd67fd44863fecbde35ccb6636ea0134cdd
font_02_sfnt_off000166e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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