Malicious PDF — malware analysis report

Static analysis result for SHA-256 039d8c6cb79a8475…

MALICIOUS

PDF

94.1 KB Created: 2021-08-12 02:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5388c3309230f0a245515726bd1451fa SHA-1: 3a3b74b2e46d93b5444c4e0358b09febd3a40ecc SHA-256: 039d8c6cb79a8475cfd616902a4b61dc1ef76f3d98f334a897864f3340a0c470
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external resources, many of which point to compromised WordPress upload directories. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to download a password-protected archive, a common method to bypass security filters. While no scripts were directly extracted, the PDF structure and link farm suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate the download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13df2e7d1f---fasomevatezoxino.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbea27529b---zavujofonopi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc39966c9---96055584639.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nugotap.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/5743981604.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/74265084.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/63115619212.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fb0020b865d1d62b4f378fc96db0235a/geparobad.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • http://jonme.net/ckupload/files/44510778446.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210625_843984BA8A7C7398.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/68034933667.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sl1tvki1etpbvri9emn912e4ak/mobokasamunaf.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/42d704bcb557464aa337a57daba1762c/32081140614.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/57154310968.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/rakupogotivurexotim.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d742e3d8eaf---mogokewagi.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/resuxib.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3e76e520247b83b5cc8b8f93ce2b6a9/fevuwisiso.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/aff12a1538c84d87217f35dd466c0f98/nuxowawijumoxaxusolaz.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/neledusaguku.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/lurobetugamewotufagadax.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b7449bab681eb96ea2f1dde7ba0c35e/67396207413.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/abd02e291370e52797c3b2ece97f1f73/91581573804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+john+the+ripper+to+crack+wifi+passwordPDF 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_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 11072 bytes
SHA-256: 99ff800e0877848aa5a3553fbf9782766473d1b072c869608d3b2a167266a5fd
font_02_sfnt_off00013936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13936 18152 bytes
SHA-256: dcb96303fa663424cd8361d9af73b65539d9ca1fbaeff284ef332771c0b96175

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