Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd610bf9cfa995…

MALICIOUS

PDF

204.8 KB Created: 2021-06-13 08:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7272ea9342ed4456814481766bc4475a SHA-1: 2ba3023707f62fc6f6b4eaf9547dc1f048dfab52 SHA-256: 27fd610bf9cfa995834ce49cb0a0b0df092c4c07e90fb4beb73789c56409eb8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware. The primary lure appears to be a fake textbook download, indicated by the URL parameters and the garbled document body text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=anatomy+and+physiology+an+integrative+approach+3rd+edition+pdf PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e24e1bced---binarotimin.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c567b0295---nojukakiwekerik.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kofigodabefifepufufev.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59481943997.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d374e80168---bagalibokumigajidaw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae978c63e---84634857813.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/af1075bdcb6a77dc5716349dcb5c3f15/4080926902.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6983e85d---59439815513.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/kaxedivilagepodo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75253c1c46---5290939279.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093a31394de5---mipojakakasomamabojo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e5969bafce73191888da2a35f1ebe898/73294555142.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81559595441.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/25016562459.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5b773e3b3720541b81fe1b5be2be3c75/26309569643.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/64743921495.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffcccd2218---vibezunimoxerixuxebedaves.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1C2 3076 bytes
SHA-256: a6a4d8644ea38e2f6e396c6ed46171eed62f536da325c400fda52da36d57e991
font_01_sfnt_off0002dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCC0 5884 bytes
SHA-256: a7252bf0815043ac0e83fd9ae1254f6764ce06afcf92d7ebfd84c289dad83729
font_02_sfnt_off0002f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0B7 18480 bytes
SHA-256: c4443189c9bd414162b1c1f9facf95a8cde8feb847b86f38764ba95332eb3d8d

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