Malicious PDF — malware analysis report

Static analysis result for SHA-256 c441939ef3a7d04b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-23 13:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acf4e6592d04131934a5dd5cbc48d83c SHA-1: d703c2e0f99649f579b3adda06463737d73d0a7f SHA-256: c441939ef3a7d04bd63352e0523134da5fb382464b7d7ca0ff2f9345e674839f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jfhcoaching.nl/userfiles/files/82738540973.pdf In PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/33959893891.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5c118e59---vaxewaxiwopiledixeloxijix.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/xetexipudidojepebaluke.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jr4qn3klc0v4fopfsntoa2hqj7/99899064725.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/77040753628.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/79da02895ca3fa6245a3ebcb35575011/nifisetuvijetogipizeni.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/tuxexizor.pdfIn PDF document text
    • http://axwelindia.com/uploads/61110070531.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/majodatojak.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/28541727496.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tukotilixulemobesazu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d9059472---xatuveruvevijibobuzorusa.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///lerejufunuwagiw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41b9e4fb4---99630893864.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/68148814686.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8mcdi9hguctuo5u1dbl75ipa46/sufajoxamokomeripujaw.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/70380363723.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210529202248.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/zavumumiduralo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e314a5c4---rokozibubawamewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=body+not+digesting+foodPDF 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 10388 bytes
SHA-256: a1d3994436026381862b4698fe8761d4516d9e8ff8e657eb9e72ec953cc7efdf
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 18028 bytes
SHA-256: f6dd77e5a636ed2f40bb6a76863b5613bc3d83eca3fd7aad9632f02a5425ed4d

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