Malicious PDF — malware analysis report

Static analysis result for SHA-256 995297958fa90d1f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 18:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d03be18d73bb0f8339a543ca407462d4 SHA-1: d583f52bcc7ed58c3f2cb9d37936fa8210d3e93b SHA-256: 995297958fa90d1fb4a1ce3b47e7eb84e80877d02301ed5829f8fed153e74424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate a potential for exploitation or redirection, aligning with phishing and malicious content delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac080e5bd---76190505854.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kisepelaranusag.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/46656639574.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/32620828341.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/66956928900.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc55ad2925d---refezavebipuwajar.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99abdc2fc---56875437596.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8343e23333631ce8075449aeb483fca9/89579998588.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8f7394a3d0f912c4ca4c8d567ce0b578/59024197780.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/wusonitejisumupezo.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/fifun.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a82358e---79810659630.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/13030206351.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa9a14d6---38240357031.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ae53b06ecce2a5150b5a3d80397e1c8e/lebepu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8228421f8c6357c89a2acd88f1f444d5/delisari.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/zejumebilubabeziruda.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/9305752110.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cd46c56e00acfd65e02a1177c21c0803/dosexa.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5c79e079---joxudok.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/63bj0lj55ujb5e9tkg5vg2a7su/64004687865.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4q06ouqkeai3i1803s43ofsep7/womawanojemofofezigib.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/nowujumanixijetitesos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=emergency+medicine+physician+assistant+salaryPDF 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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16608 bytes
SHA-256: 4543c8f4a10147a31eafc122910b31ef85dd41a4d109cdce766e7efc61c7ffc8
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 10940 bytes
SHA-256: 6c0b0ea3c963bdd43c741e283cfcf22103789270bf4d70dd19eb5215390ad51a
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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