Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9f73e3a0514bb3…

MALICIOUS

PDF

77.2 KB Created: 2021-06-29 07:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59a0990710220a3e95133016304f18c5 SHA-1: f531e8c6cf705b2bd90d3fdbf7142f0005756142 SHA-256: da9f73e3a0514bb36f37e92df36e3643252fcfb964aefd0eb1f1f24e5954f618
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dragonera.cn/admin/userfiles/file/doxebeze.pdf In PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/1160334671.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jchtvhtn1pcskcl6hkthnn0e56/69343032793.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/955b637964d6d760365bb8d9baaf3d90/nudemiwararusidajuginuli.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/16231377975.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/25093696642.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wuxelopelak.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jojfe4f945pf6tsg200p1vo4rc/43499915329.pdfIn PDF document text
    • http://bakoca.hu/files/file/livulikogelosilo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/166234e8cf8860f3470c4ca34eb124e7/37335794835.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/tenubuvativekar.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a419a75a2---xamimapasumu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nodedamonevewazijaluxab.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/19182466430.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mdv6rc8fb9ohpgrcmgpkn0d596/31899644274.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/47230180270.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/soxiseruvidositapidifok.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xobimiz.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/rosujusodu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f98e90426---16926305480.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160869f43ba582---gagavudigerurur.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/87436870430.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/34654951818.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1b925f8---rizixodusaxibenaz.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/223d403ad5ae9327e40d4c94ae0d937b/kenave.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78503573081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=butter+anchor+unsalted+hargaPDF 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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 16808 bytes
SHA-256: 4778ddee7d389fe060c9cae4f62b4048a63161984c7bd1b8f280ad622949399b
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 10712 bytes
SHA-256: ab4c05c62cfa4a60c7ba2754f692875e672e30d8c3302c2f563e108ea95968f5