Malicious PDF — malware analysis report

Static analysis result for SHA-256 141f54438d498e99…

MALICIOUS

PDF

89.7 KB Created: 2021-08-02 00:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 022aa5f4a7fbf2080091bd6ef14211e0 SHA-1: f38da77bc50db2d94102b5d14ac75475585a5e40 SHA-256: 141f54438d498e99541d3b9c5a041a8ca415ae0d590af78186f32440d4d68691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yuhongzg.com/d/files/58023234360.pdf In PDF document text
    • http://prochem.vn/images/uploads/files/97739244501.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dmpg71tsnmk1umnano19nhi3r2/34374177705.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/4d55dd544b987af88f5e14b5714512a7/xapopolud.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104b5fcd45fb---97430811881.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xuxabawopizatil.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7kk0cfd3d593eng6jbbdvfo76t/vimuzevowolo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/fotopeleg.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48b6b1270---mopixufegalefepadepakoza.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609282d9cb887---boxatonedaxepesatirabe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b26a7c73---jujopimomominodemixenira.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f4edbd7dbbd052d33bda0bfc56dd665d/33452080634.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6588c843---5298529592.pdfIn PDF document text
    • http://apvn.info/userfiles/file/88720785958.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/pidinofinofepuganarapebo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704196aa7d9---dowaselubozipub.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/waziv.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/20f047f4aafa5603ac3b8b2524b84e7a/kifuzo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed0a4738c---zojumotel.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/4841021299.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052417282873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+cook+frozen+chicken+on+a+george+foreman+grillPDF 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

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_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16856 bytes
SHA-256: 8c7daf464b5e08aa57396c6d06f1d3369f2a2d84467425821e702608a3c47d2c
font_01_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 10844 bytes
SHA-256: 6303e70e8394e11eadadec50fced7ae7634ac12652ef2f1a390dc1688fcff1f4

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