Malicious PDF — malware analysis report

Static analysis result for SHA-256 6510b7ecf6796827…

MALICIOUS

PDF

75.9 KB Created: 2021-07-30 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a86ae19ab7f6e60b0d11ac90185284a4 SHA-1: 7458186609dda12e5db2e594361e028ca8d8d1ab SHA-256: 6510b7ecf679682771c0e65ff4184213f7d32d64354c77d333b5ff439dd83885
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous compromised websites, including those hosted on WordPress installations. The embedded URLs suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=%C3%B6l%C3%A7ek+ge%C3%A7erlik+g%C3%BCvenirlik+%C3%A7al%C4%B1%C5%9Fmas%C4%B1+nas%C4%B1l+yap%C4%B1l%C4%B1r PDF link annotation
    • https://accuratesearch.com/userfiles/file/48660932113.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7fe9e83f4c19320ac8caa958e98b57f0/fuvibebajarapiperojena.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/57531118348.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4d463235---77531796738.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210610_A9D1C372C756E819.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a9487d529ca---5274951741.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c7f4e90b0c35383a262b49bd895b9a22/36226828184.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b4f9f285ab3c1a3cca016b2a781d7bc6/85659669124.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dupiselezomopukemenet.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g4vgdp7utsou6fuu5pqo79toq4/katetukafoditugitus.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210709_C012CBCD1B8573C3.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160973e434a17e---walesifefinup.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8969451a6---vomusuwepuwitebusexujumis.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff0340b87---46627023468.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/bedawaxerafunima.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fefixuluxizigoza.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/93270137099.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/06628681649a7f7f4de87af033b3e39d/1365589212.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/dilomotoxuvurusalibuk.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/82347235297.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/79911785418.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/8119768331.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8d3a9d521---61175873356.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9206dccae3325772fd55b6f593a738ff/45936104700.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_off0000c071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 17952 bytes
SHA-256: 522def0b481a6aa0c739f00210d8bb78c596c0b375f1fe6004bee8b79693cd53
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 11452 bytes
SHA-256: 3ee1030447f7d43b732bdf368020f3a915a60099c8fdd83cf7c96e15d4373ca8