Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e45113e0cb5a986…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 07:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6911d10cb907a57bc33d1705f85fc4de SHA-1: 5f6a781f019747def248d33e42896d87a05e9ab3 SHA-256: 5e45113e0cb5a9867a8c744d5ac99a675241bd966d9dfa8939a56ecd79bacfc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ministryofrum.com/memlogos/file/safalivupifexiwi.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/88561911200.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/63275147693.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jetimezuser.pdfIn PDF document text
    • https://businesslife.com/content/file/wavawobitumasokipipidevi.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/nimuwabazaj.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25282102493.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/86243459923.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/56127903570.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138966645412---xubezobewaw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613215a33744e---82152597335.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/4326690058.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/xatenilapo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8890abc4---nuper.pdfIn PDF document text
    • http://tyextractor.com/d/files/begonosevanusemeditafo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/59525360876.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/noxuzisamise.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b44130104---mimibezijaredi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/19405432928.pdfIn PDF document text
    • http://sdds.be/userfiles/file/33578278727.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/jafulobejobilijubiw.pdfIn PDF document text
    • http://surausa.com/uploads/files/93554210594.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613992dc5d7fa---6266120435.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/masowutalutadunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bowie+last+tourPDF 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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 17408 bytes
SHA-256: 76ab72752c66f8e3166a4ed269fb97b421a5033bb3206c7c4570d39cef5e67b1
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 10236 bytes
SHA-256: 46cb274a284190e4a8d3ec93f62ef30afb644e20a897009066175ca7078b6edc

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