Malicious PDF — malware analysis report

Static analysis result for SHA-256 981bd71fa8794cb7…

MALICIOUS

PDF

117.3 KB Created: 2021-07-03 02:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d3f7866d273b56925c2272f2d3e1560 SHA-1: 3929470d86084ead5eb5b4dbc879b4e600add324 SHA-256: 981bd71fa8794cb7f69280f1d4c2e355f57972adee6bf492e7f9576a408bd40b
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, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb173be70---wixubimifukuv.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wenam.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63aedcf8a0---14828123995.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3b64a484b6979f938c3e5d9c37e90a44/51468076328.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9qarbrupf61mm3lmm3l109sel4/82621851691.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1eae20961---32777459969.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1505c8d4d32a90994c8c4d9e4cd94c94/55619755532.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/341391af3dafa2d88ccdf6d9c6e507c7/8889940443.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/ziduzebejenigixig.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/use3vhkraahtj5ll9mi6ol7vij/kamugetagagelezoxako.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a85bd0778---kotaxixinisibuvaboponi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gobor.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/duvinojopajozawikida.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbb63e506---gonuna.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/22641204323.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/82088162657.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/31420227979.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f596eb46---55174014531.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52241613277.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/lugezajuperakabufelu.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/rivogezagovered.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985a00145ac---bukalipuvexufiwemumaxasa.pdfIn PDF document text
    • https://pmms-online.com/assets/file/6811404742.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e01b77f06---96238372580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=joseph+campbell%27s+theoryPDF 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_off00016adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADC 10720 bytes
SHA-256: db869638667062b1ab5c0c33e1dec0b7b94c2bbe123e9c8b897559ec78fe85eb
font_01_sfnt_off0001836a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836A 17308 bytes
SHA-256: 1a1992d3dcff4f5189f08697b02d2b1c120c59e3f348ea71bb6c7dbb6ef7f1c0
font_02_sfnt_off0001afe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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