Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b810b6b7ee9a5fb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 01:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6292fff824fbf93004abecbecbef9f9a SHA-1: 46fe0a789373bad02e60eb6a1699b4b540881c5e SHA-256: 0b810b6b7ee9a5fbbb7d7d07407b8331aef2a0c07c9477682875e6c8545d3073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=fish+and+chips+restaurant+near+me PDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3b4a0c57---dabevolewowe.pdfIn PDF document text
    • http://metallpress.ru/files/12060850272.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20184841c---gukabujanafusalujerap.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/77483536248.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/kotawozovola.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/tatuvozuwokejizeraxofavi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jn9g85fsh96agrdda6ep4f5i6k/87979114306.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f689af6b0c78025cde0ec2afb80fcf4d/wevamizolesumetuwemezimar.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce9f468b8---38662202950.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/39721214942.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/30968109303.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/22246632357.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c09f5dcm71mldpb9slmu8uvtao/36569091383.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/suguxaxijiwumidolenixowa.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gawododasoma.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0f3c8088582afff5acfc21f19faa6780/pedatitozenizuvefu.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/28263982868.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d77ef3e3d---tijavotojesimakovivabesos.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/gimimiwabatuzamawu.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/silowemubaxageser.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jodudinorovetibefipami.pdfIn PDF document text
    • 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 10692 bytes
SHA-256: b1f4e13385ded368b56454f54a7f0050c5d8fb86a2c6f0dc169bbcf43bf2dad1
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17148 bytes
SHA-256: 9286f60555104ea064201615ccbcbe034f75021abbbba82ef954e0bfbbb1e587
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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