Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49532a9da83227…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 15:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbe5137960d91568c7a9704ab5d00107 SHA-1: 2619a17c79f2ae489668b5af1a58384c13e3046d SHA-256: 0b49532a9da83227b2e109122a32c529135551ae6bba4408cb93f0e0c26e479c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites, likely to distribute further malware or phishing content. The document body is heavily obfuscated and appears to be junk data, offering no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://nolimitscenter.be/peausitive/images/FCKeditor/file/9535964059.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6591d4f8d8---wokesoxif.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6abf2b41b---jovawok.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738b5eed851---gefovanisewuzuzoxu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0up2ee7ob10c9gm1r5i7vi9mf4/kanibibaziz.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c533ad803f75e0de3e88e93d8887e420/33139490181.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/xejukaberelabimuwevuzoxul.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/85108158259.pdfIn PDF document text
    • http://adamant54.ru/userfiles/files/nebasupatuzenux.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b3aad490---nuredevidigavobureduligez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/90571689473.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e772adb94---40070680335.pdfIn PDF document text
    • http://imbirimbir.ru/files/gevajerekolupuvolezaw.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/nazukafasimovutajemix.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/23144533085.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105409d5efc---getoxufinesuro.pdfIn PDF document text
    • https://airshow-bg.com/file/wolijaluvoxamopizob.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/82463758741.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/xilititufaxejoxi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vriob7it88a7gn365jit6l7lgn/jabivotejugotu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210829084715.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/nogavez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inverted+meaning+in+englishPDF 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10592 bytes
SHA-256: 6044f90301f27e3de32ca7891c9a4af00e52eaca31ea2e693ceba7d350cdebdf
font_02_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 20028 bytes
SHA-256: a35474cb8605fdd2874cf91fd741e5dd4a8bbaaa881d370d647776a2cf5d010a

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