Malicious PDF — malware analysis report

Static analysis result for SHA-256 f048ebddf762dc73…

MALICIOUS

PDF

99.1 KB Created: 2021-08-15 21:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7760d96b9302350b5847c17334b0a85 SHA-1: 7d6a870440268aa58c0ca759615399309e054122 SHA-256: f048ebddf762dc7306e798c55ed3dc42c417e42a2e3898fb18d1950dec8f9728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://allytemp.ru/uplcv?utm_term=estructura+molecular+del+acido+estearico PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdb8b7ea2---20635290008.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jeseparetex.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/kamajovizolud.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/54c6744304eb7f2e537db3de0d4eae12/kepulisafekalijelira.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/nunafuz.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083167f74353---suraz.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/71068742113.pdfIn PDF document text
    • http://intersonik.eu/upload/files/darifunatejefokede.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cd6f1591ecd6f5415d9eed721c898c58/4882693530.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/83193925379.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117eb98e6818---fivowefupubuvuvewibosi.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/vukisujogopekajekepexore.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/17607032125.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f4373384388bb8e28a17b239efa72ab6/15032437865.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/53736477584.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/00ffe616dc0e476ab4890eca1e5d7885/4193731086.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cjm7l76ggap1j57vljdcvulvk3/zepenetexomisig.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3e02d086---94205303618.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoom4n5ir1u6bld43k11pj8ms7/29221618065.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/20239138745.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/novosofamelafotibefu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vd3aulbabbvpbb070a4mlohm38/zopemiguzunixenagofo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepubotutitezebinofofexi.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_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 18276 bytes
SHA-256: bded9de3783cb33cb533ca3856ec3a92c5f3f9bc7068fda8843c1d1f1fe72455
font_01_sfnt_off00014c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16455 10508 bytes
SHA-256: 584fdce254e0aeb4521301ae7f2a993084b1b69dd85159a07e3a3117b1f5fbd4

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