Malicious PDF — malware analysis report

Static analysis result for SHA-256 a753d2b0926f0a30…

MALICIOUS

PDF

102.5 KB Created: 2021-09-04 20:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fb8d8ccb99a970dcbe7b5cd48f9b91a SHA-1: 038ccc88910910465c8a42fe8952545ca77c939b SHA-256: a753d2b0926f0a30e6b50c46a3d06991a89c93f801e7b4bf855c2c0c07edef2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amandamaitland.com/images/file/32719571620.pdf In PDF document text
    • http://cerrutistudio.eu/userfiles/files/77745566622.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c0065feafd8b02f183600bfb8b0e0150/biraxetijosojinuvig.pdfIn PDF document text
    • https://mattress-leader.com/media/21570541341.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67760caf6e---36485091395.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/3651058766.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d9b6d7699---81284897738.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/batefapatitumoji.pdfIn PDF document text
    • http://vizcsap.hu/files/file/78020760580.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/benagufi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/046440b09ca0e040884380c366b61428/98598106782.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/gekezefasarewoxesej.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/sefiruxitalanipe.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vafedituwetadumikini.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/fezeketafovuzavijobatuka.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jimodirofalerero.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968d1e64a7---fepidefaterut.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b59fc74e5ed0cff3f9a5c4121dfa3f23/36258269003.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c25d3e515---99956084389.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bad4c6b8---lugiwebilulodebi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/03267b8ccda0be29e3b161d2e7ebcf5e/16005296444.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/76877911115637db6195b6ca01675d8c/wiritufafosuju.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jufovileduva.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dd253be99f247ff95fb78fc1d239ee8e/54885331473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=high+school+football+weightlifting+program+pdfPDF 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_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14058 18780 bytes
SHA-256: ed41a5031e47e04115f272a0fa9d4ad7b850699d49b1a20e341d17329f1152c7
font_02_sfnt_off00017202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17202 11284 bytes
SHA-256: 012cbe01adb848a36568b9c88911f765f4dfa2786b7565cb0d5f7fc710a2aec3

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