Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8547a0f0f2d398f…

MALICIOUS

PDF

98.0 KB Created: 2021-08-09 10:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17cbd8fa597d17527543e87a3ec87334 SHA-1: f539a8656417524741c5d453542cc88194634078 SHA-256: d8547a0f0f2d398fec22ef4f01787ea2ee71c00d509b2ed3de9a231f60bd5265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The presence of numerous unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9cedb48a---50014062731.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea083479d1---7877136941.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/75510608717.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/87893785052.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca49dc26cf8---93196096623.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ecd2011026b74c22d1452c8333508a/22280482611.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/53764266991.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9bcf71efde3e51b2a627392397cb7b80/61378014333.pdfIn PDF document text
    • https://digiconelectronics.com/media/59783117581.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c74d92b5---gowegijatakekenagejibud.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wifigaba.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d69f9f568---bevipiselibor.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/riferemivuzerizodel.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28c3e8fb3---90115110798.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/67467135666.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/52446949967.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7abs0m7j5gst6fcubo5vjka7p6/bowobixupawaxufelaxavod.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/1170299663.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/50104169393.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/496759ea6058e04998f3415d063b4e5e/60755473064.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765997d34af---5833466911.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af985ea81f6---99510971962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=where+are+the+panel+buttons+on+tcl+tvPDF 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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 17828 bytes
SHA-256: 832d3009490c6ec297453f04a0d6e9fb1ee871a5686e2fbe673773d8abccea50
font_02_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a
font_03_sfnt_off00016098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16098 10676 bytes
SHA-256: 0bf1c30f6ba36457aed60968b65f8678d7fb633a9e5c6dfcf477d911642d2015

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