Malicious PDF — malware analysis report

Static analysis result for SHA-256 9782c6d5d6f7e2c7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 00:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f55f2acdec63b06b6b44ca1b34d9bcb6 SHA-1: 3d34e29dddeb0dfdd24322ca4d27fe3bb05d42b2 SHA-256: 9782c6d5d6f7e2c731ef738fd9152b1cacf7951f037dc9f4e8179030fbde9cfa
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains. This suggests the document is designed to lure users into clicking malicious links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://starfoil-mail.nl/uploads/wysiwyg/41802214910.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mixewuvamukemewubuja.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210919_D86C02DAE48CFC62.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/23779488470.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vupamuweb.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/27242202039.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gukesewujubiw.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1eef60c543b3b2850628ccefc8310827/wimute.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/30629389434.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/15521479698.pdfIn PDF document text
    • http://inica.org/files/file///xegiditupusufejize.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kijikemarikinaluwumorefiv.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vijanaseki.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/nuxurufuzun.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/46379582313.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/69013396744.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/64934074549.pdfIn PDF document text
    • http://knauto.com/upload/file///domekosamune.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210925040941168909sjrzn.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3699680871.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16147c68077872---36929675410.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/valadidomozimu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zotamonerukolufovu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2693e52c18b47dfc0005a60da37af323/wonafojanewurodasigadalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+pptx+converter+freePDF 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_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 10316 bytes
SHA-256: bc2d4e20f438c9a5ea6b5a2a1ed3422eca887055342dcc34ee7af8a665b7751a
font_01_sfnt_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 17360 bytes
SHA-256: c209136992c49ed6de324fafb3e9bef84b00a386aea3005960599d4a86bc0874
font_02_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1