Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ec28245216d5cd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d00e8a08ab673741ce66a69ffc65b2f2 SHA-1: a09eeb8d8222c61a23a74e7ae7ac43f72ed1ed20 SHA-256: 45ec28245216d5cdec60c31c024fd7f478206e66e6de8358818451acbb5ec45e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. This pattern is commonly used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://kodemari.info/data/files/fobed.pdf In PDF document text
    • http://pension-erlkoenig.de/img/editor/file/jobemuxozug.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ef9igrda8lvnnbr4ccr6klbl3f/73561907453.pdfIn PDF document text
    • https://seikai.jp/free_images/files/lokalatitase.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zezuvidu.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/xadukasifezowekesiwutorog.pdfIn PDF document text
    • http://dentali.cz/files/files/87016844398.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/78071230824.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/83616715733.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/kubematasotinegovibexun.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0003097ceb---legegedapiwutit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad310309b61---99240032405.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5acf53342aa3608bd8899e7f155d7213/32612603809.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fea87503e3ddd4f508810c69483e2cba/80884131022.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zalojidil.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/60aa9728d5e33acefbc08143ec543e60/54115073771.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r6d59f88p05kvnfrngi2olaeqr/1305912136.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96580620983.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/76864783308.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/767ffe2b6138a1091af9d506af1402c7/45045416199.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/75688166064.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/sutawutawiniso.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/poreg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quartile+deviation+for+ungrouped+data+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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 17856 bytes
SHA-256: 1a5d07aa569a3963abc342cd11e209814afe4c72714cb6ccafc316784de1d1a3
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 10728 bytes
SHA-256: ab81fbc9453e4b25a3466c4f8c36a708e21540b078cf9dc5d13be73bd20fd842