Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df64a09d1afbbf1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 23:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba3a1eabfbf95613e91f166e10b62395 SHA-1: 93ef5fa32dcb433cc51dcd94114ebabdffbc71cd SHA-256: 0df64a09d1afbbf1e0288bcec740e65fb6ee28be4706816a44b7ce38972ae3d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, indicating a likely phishing or redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or lead users to malicious content. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dqunj0nt0vuj6969m0d4dl4mpe/kekuriwuzipapulipasij.pdf In PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • http://actinq.nl/upload/file/99657249226.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/suvezexagexipuxibaj.pdfIn PDF document text
    • https://fasaac.org/temp/files/zorapasa.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143261cc5ff9---debadevu.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/14807377916.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142081c816d9---56139491540.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/90160045881.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/92553348729.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/pukakexuboduf.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8d4264cf14f9a344b009c22d1c7ff9c/jodoxemekujibovimudur.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0531036dbb5f4229c93dfce072ec7688/gaxulujite.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/rimawane.pdfIn PDF document text
    • https://virker-ikke.dk/files/jezene.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161300e677fa5d---guxapoxagowumukaredixaruj.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/60965354001.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/mufeligigejidekipe.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fevimuba.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95117741936.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/48176651581.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/sexabaxutiniwagojukuris.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95480554833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=five+nights+at+candy%27s+1+androidPDF 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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 20008 bytes
SHA-256: 83c354cc5715b13422c2deaf0e30e03682b589258e58b23dedd40c7da852f5ac
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10844 bytes
SHA-256: 9c16d7ea5ff17f0f6804c76fa9fccd1608a09bcd2c3ff23a22891fc1d2f03fc5
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1