Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5d9a2f8faf36d2…

MALICIOUS

PDF

104.3 KB Created: 2021-09-24 08:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 769d98e6f8ea8f32361837953e956ca0 SHA-1: 2c497a7a3860d87b0384e1d2a6987760af79d0ab SHA-256: fd5d9a2f8faf36d27a2d29bda71dbaeab88c2be1389edb49b73246305b394fc8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs suggests the primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d101889---92509955544.pdf In PDF document text
    • https://sakesushimn.com/userfiles/files/34074915372.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/17150957701.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/98069725085.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/64111635418.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/mutoxodujezitazagip.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tuvuma.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/35941807555.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fda913f39---lejuromijana.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/52806164804.pdfIn PDF document text
    • http://standdominica.org/files/files/76192267660.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b7004826e7feb6a5e0f8c5037bb57018/69648005055.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/jalomutajeloxomul.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/86037973770.pdfIn PDF document text
    • http://birdwatching.sk/media/file/xogotixarotujavufugep.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/69513200755.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/rifadiwasagopanotiba.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/wumevofije.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jumiduxoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f3ef0930---31237925573.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/14190907185.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/goxujanubawumaluvokajuwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=enders+game+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/4824055556.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_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 10468 bytes
SHA-256: 0e47518c45e5bc46b22d20e6985eba671c2ccb50decfb7bd2d9f8e3f6c127f6b
font_01_sfnt_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 23608 bytes
SHA-256: 02cb21fd375724e0191650b7aa5e9da90099077909a253ff961962aff14eaa1d
font_02_sfnt_off00017b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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