Malicious PDF — malware analysis report

Static analysis result for SHA-256 861525649ab2ff1b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 08:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 05a82ca06d81347dc79528f0d8e6ecc2 SHA-1: 9523abe2ea70ca956d49c6f37ef0915d5fad78ff SHA-256: 861525649ab2ff1b39d17dda44dbdb02b382f623a663057f0641e88ce1b0eb59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://akinmedical.com/uploads/file/nolanukoku.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6ba084ebe7799c62deda9d6a18b87bd3/87437987759.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/difufokavos.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/lobavufilesegemagokinokir.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/9835750007.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/piliwopuzejiva.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/6965224000.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/79776841531.pdfIn PDF document text
    • https://windsbs.biz/files/file/xebenezok.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/95799974681.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/lktrn3bhca12iqrh6haruk4vs7/venipisuterunoxured.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/76483423128.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/zawunofutodogevolon.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/1950780000.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e041d610796---5357388660.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vlljfa3atrf2cv3ik4bjm27460/mukixudabaxev.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8n8fuajh3ap483a553ul36r9gc/kunijuzixiwik.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c877a2a3b428fbb4b58c45ee757a25bd/sudajagikes.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89c759c531c2dfe81ee4fba4d019e265/gozupuxixetamevefotebeleg.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/xoxifumuzaxawu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d69f1ea6a21a21dab79029c3cc92f924/topuvajuvegilowuga.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/taaqh01a5urgs2s59ngbbpuer2/57703077228.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/57fbh3n4vldfvnha04ptpa04d6/resimivij.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/fesarijaxavawijizizolo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/26962662187.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/zuwupevuzugug.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/011f8a5f6a5d33a354f811f7b2696662/zatesefitikinuzaniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=greenhouse+project+in+marathi+pdfPDF 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_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 11108 bytes
SHA-256: e1697926926748ddc92455600a0dcd6a6a298785c9bc6ec20e7860a35535e4c3
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 17328 bytes
SHA-256: 12582368db8a09506d9db8061d6544e6a806364196d63a6b26d684b02ae90240
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1