Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2741dbfaf231b4…

MALICIOUS

PDF

92.8 KB Created: 2021-09-05 05:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 978f886215df5ef80da71e20b096e989 SHA-1: dae5e5b259f50c12e65cd1147f96f8fe4ed6d537 SHA-256: 9f2741dbfaf231b4e846c2ce12a6f9196a0707c884a41ac9c34128044a0f0204
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://geredekombiservisi.com/userfiles/file/vigowutofek.pdf In PDF document text
    • https://aneri12.eu/res/file/vosojo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8636f43360deed0d2b90302a12a14671/kekuxowufitagonutowewi.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210617011310189.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/koborivolipis.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/zuromabimikasinetebuzixif.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/pemawisopozozodul.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708768e3dad---24310177358.pdfIn PDF document text
    • http://packamate.com/userfiles/40125482847.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cdd4256c8---64527219793.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/39689102031.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0dc1fbf2---gananasotiwomikelipuj.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/66348502228.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/52132693730.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/suvalero.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/lefubopavapivu.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/42705536192.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/lefagaliv.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/bc040efc3e7ad239196c1d3fe1e51805/70952405111.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4693996eb---82633454598.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/82599233039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=il+canzoniere+della+morte+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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 10624 bytes
SHA-256: 1fd1b9d933ad662594f4617c3e2636dea728b26ebbeb1871a0baad65bb06018e
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 18236 bytes
SHA-256: 0a5b76651adc6c9fd1055127bd2da1df7edc4fd4c34cf207f7098ab57a68eeda
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1