Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f31fceb43e79d87…

MALICIOUS

PDF

76.1 KB Created: 2021-07-25 06:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65003bcfcf2c8d129573af72bb10fa9e SHA-1: feb6c759712aa1762cba3b35c217d5296478b8e0 SHA-256: 0f31fceb43e79d870b278459ecb5d8c794598e68d7f6b96d6e573fbc0ac278e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking through to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ruk1f1u6uhsgnd2cf1inirml95/88780591230.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/xupifasulelo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/dapunedinunuxukolurimojo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4b1f4955b0524a51bdb29cd319c00936/gawixob.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7095b065---dodojobosevopad.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c1c9c7f7---nageviborumupo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070417b71b93---didoribazanozavasilo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210701012635_645945123.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2863499c7---tegedenasixavawisefuziwux.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/22481019429.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad850fca552---87874235919.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa7b99ae7---88163190909.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zojidezifosojokokofaneduz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/dejujagukanux.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df32238e8d8---85857018080.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/jenezugifebugagiz.pdfIn PDF document text
    • http://tyextractor.com/d/files/59961231819.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/54780707086.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/50808988e59eb4a737d968608864f8cc/53774981607.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jeregow.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4f49fb5041465e4693212839f8ca635c/pirub.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/46142182587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=data+structures+and+algorithms+in+java+6th+edition+githubPDF 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_off0000c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 16048 bytes
SHA-256: 60e16e119e1d133fe5ef9bfec2520b0805ec8155fdda2cd919fb2580d972581f
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 11424 bytes
SHA-256: 87f02a57d6773bdb7a3d33f9d7a93ee35d64296636db639e68db2bedf5dd771c
font_02_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1