Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6160401c4cebb1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 20:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 560c5fda68dd33f54f37c12051975ccf SHA-1: 09ac045d5bf522babffb1a9bbd4dc37c876636ca SHA-256: 9a6160401c4cebb16c71e8840cb8c907877211d2a2a2c4570d305a1e7f90fcd2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aviteksural.ru/admin/ckfinder/userfiles/files/16966334549.pdf In PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tijedaxafasimudek.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/forar.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/rupexudimo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614274419db77---81137030082.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614440139b651---monabogenogire.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/desidulevuribefugisewap.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/39407428755.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210912_051f7.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vutanaxuworumiwaj.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210913153536.pdfIn PDF document text
    • http://bndweb.nl/upload/files/95154705373.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-5/20210905075647437620.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090613051235.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49e7e786a---14049972934.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/berevavokepipabuvolasixiz.pdfIn PDF document text
    • https://biocoils.com/img/file/gidepirixukekusipe.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/61660682329.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fazuvexifa.pdfIn PDF document text
    • http://kasand.com/userfiles/gakegow.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mixuxafelabezunibexadiwox.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88e0fc89dda789865fe0697c4407dcbb/lokekuzajoxuko.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749b48a98---jamewerapapeb.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zaxidudelatobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bared+to+you+book+pdf+downloadPDF 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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10816 bytes
SHA-256: 1231c9de7a3d0279e5272338d571ffc57f2c6a4c992a2877f509472baf029c2d
font_02_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 16808 bytes
SHA-256: b14986f834691624c8b9926296f972cb91b98e33a5f7a1e83a65ef745ddb8b14