Malicious PDF — malware analysis report

Static analysis result for SHA-256 2010249b80b720e7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbcdcbad281d313fd71e86c0af92d9f3 SHA-1: f7beb72fc7ca7a23cfe0b763d6b00833aa9722a8 SHA-256: 2010249b80b720e7f9bbb8e2eeb3fb9b19289b8f3cf9262429e9d093d7b385c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious content disguised as a Messenger application. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd51725c778c6313e4c35b3d06c87a19/39213388689.pdf In PDF document text
    • http://spokoino.ru/i/upload/files/vapesutojipagokexopone.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/53805613389.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/44353382562.pdfIn PDF document text
    • https://la-klamm.org/Files/files/dutoratazimodijaguwod.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/90492659947.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/20409127671.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/8610335302.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ce39aa8f---19031019905.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fizetigexadalubef.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/67337687406.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/80378408359.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/91561271602.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/41741059408.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/19310294161.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/48129966337.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wimovaxorejewage.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120910225251.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/sujilubup.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/muresowoxe.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/suxujakotidewikigarinoz.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///82783285018.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fbbb48cd2825227dd591fe365b7c034a/nutawewerelajadufiwopemi.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/18998111301.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/86061326483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=messenger+free+downloadPDF 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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 10420 bytes
SHA-256: bc9c47f1b0b8e20f4e21d9daf708e6ac5913de6fe90aca69378d3cf166d5326b
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 17680 bytes
SHA-256: 107bd296658a01697316e9b79e56f6e00d0ce751ed6ebafdc97500089dab73a0