Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6586578a23bee1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 20:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c237e0a39dc7bac1d0079c9862be476d SHA-1: 38f9cc7df7b24a36d30a897e5f84472f830f572a SHA-256: 9e6586578a23bee17c84a9bee7e89ffd1ca705aef8fac8848eec400570e3fed6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristics indicate this JavaScript likely functions as a link farm, directing users to various compromised or disposable hosting sites, which is a typical phishing or malware distribution tactic. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://scoutpate.com/userfiles/file/7786220582.pdf In PDF document text
    • http://www.armstrongre.com/files/files/32568281664.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/atc10rce9ju1irt30euvcaaraa/9793345421.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/97020484323.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/57722220816.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e135aa3850---lavuzizamapeninav.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/30965421085.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/38842991477.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9f664734ae2eaf2228d498e11aad631e/maxotokuxopisuj.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/65042930303.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c3ace188736915784811bc63219f9a0a/19352101285.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0af7ab5a---92125401394.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/80311e189b4f497d2efe43458231c1bd/pirefaxaguwixepakefiri.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/govudexigu.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pinagojumaxitodofadiboli.pdfIn PDF document text
    • https://2acontractor.it/images/file/dajap.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/65197371882.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a39758b93b3f3eb4375364a3bd214f0c/misutaweza.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/365hoao5ild7fg083e1aucpf92/18985119981.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a829aa2e8bb---talomakezadifapifetikuxef.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/44645965384.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/botetutagemekekasijopego.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/71542496043.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/dujuzediziwekoroketeg.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7aea67ba---tefonegosokalotepaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lista+verbos+irregulares+basicos+ingles+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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 20252 bytes
SHA-256: 55f47c1bda7f633a415621cb2508a9b5104918a42ea61cd8cd773d9955eba81e
font_01_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 11060 bytes
SHA-256: 542eebe436bfb4c907b6495f6638355b4e0e0cbb7768f23685dcc37012f710a2
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1