Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe005b2467d7ee6…

MALICIOUS

PDF

109.8 KB Created: 2021-06-28 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a6681a9ce549024ce7a48145c1abb376 SHA-1: 69e367a1545ad31ae692e850685ecc59b09da3e8 SHA-256: 3fe005b2467d7ee6babaf7399a20122a679f70665d92904225a82e0303670dd1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a lure to install a browser extension or update, a common tactic for credential theft. It also hosts numerous links on potentially compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7413d01f---21028034414.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f76fdb410c0750ffc3e96cb00c7e5900/28936218250.pdfIn PDF document text
    • http://gtshotel.it/images/file/xoworej.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/46909337090.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/526085187.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/98c9cdcec95883333e1bafbae4b826e0/sarof.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3dc443e6---keduguva.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4f1561bece931966de017578b1b2152f/kagukuwexovomuno.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d706cad8---mavamejasodoxituferis.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f107303008bab6f23e6305372d1d4575/45169950551.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0a728e1323999a48dfcc4900265c7e42/70722595330.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/lisuzuzureramaxabosutoru.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/wugafijafovumulanevit.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/77826369840.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0f66bfa1f234f69ba6dd3bb6261905d1/37466846053.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998afd9c2a9---17824281739.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/xopoxinegojirigelamimexa.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/ganavejololuvadipiga.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bf87kiodfo3p26u1pfeibqqjk5/gekifowozabubujexejalig.pdfIn PDF document text
    • http://m2m2design.com/userfiles/44722987773.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bc004c78---92100832704.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f832305---6240642972.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/21d08e739dc67661cf8aefe526af9dbc/71531378199.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b93aa9e8b---84068810411.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca421d9fbe31bb06db8bd23866496346/58370491783.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210623114902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=get+rid+of+search+baron+chrome+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 16136 bytes
SHA-256: 82c6a3dd2bee3bbff022072616cdd4a1317e9031d468038fd4a2894290e97ba9
font_01_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16313 10872 bytes
SHA-256: 5aa208181e74d5502e7290f9377fea0bd4e849f98a7751e568dc77d817a1fde2
font_03_sfnt_off00017c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C07 17200 bytes
SHA-256: f1d677bf9907400d6353035be626f0ba11decc1781b56c6bcb589e4dc88e16b1