Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c09d93eaae85b4c…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 06:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a5ee5acdfe74f786b327e7614dabef27 SHA-1: c0139437c75bf117d08dda8a7207857cd68a21b6 SHA-256: 3c09d93eaae85b4cf63ec4edf95dd5fee19cf6d7ab8ef7352353a5a95dea081e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, identified as a link farm. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2515a5a2---tebuxo.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0de1859c7---zowafe.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/95566322717.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/27089859003.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab7317cf2---xurijaxiwofamobevigi.pdfIn PDF document text
    • https://sy-tech.eu/file/51922608444.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/posojeluzaxinerive.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8739d0d1---zavuwagewuvavipuka.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85336b2b58---82144344504.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee5d73757---19608113851.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89527df6e---2128300492.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1615042b70---mubufe.pdfIn PDF document text
    • http://fxmeat.com/upload/file/00d06769883ad3d6eff55303e5e818cd.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/14826102423.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bc53bdec94e1bbbad5ed0418ec9257db/luberefunuxitobuvaduxireb.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/18188639619.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2i03v93i88oq9rv2ihdroqijo9/63654703769.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4uph2aep3gcb34nt163r1sttaa/16068749048.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wunusewenesojetupubal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ecd2323---muzamilowesirezot.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2db34c809---3685485757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=introduction+to+the+practice+of+statistics+answersPDF 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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 10808 bytes
SHA-256: 1805d9db9b80b5a2f01ed585d20a1220a3bcb46bafd140c71ac6c7d11780d18f
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16948 bytes
SHA-256: 625746ccb28cad5beaf392b54c0710f912d22e31af32266644ff13ed2b1edbd6

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