Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9e457944483efd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 02:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 254b42c4f2d82d08019dd3404709fced SHA-1: d219269603cbe53155ea79ec0bed9020f4e206a0 SHA-256: df9e457944483efdc283a787604e39970083c1330c09c7a40d61a9b11385ab27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on domains flagged as potentially compromised or disposable, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fcv-bo.org/data/fcv-bo/userfiles/file/ketibedup.pdf In PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/begavavigizafigefetok.pdfIn PDF document text
    • http://k1a.ru/images/files/file/mozaroxabapasorusupemixe.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/dejejaremasodevu.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/zezagerozimuloxemeb.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6074913881.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/68795613517.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc0b6781---luzipu.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xejinoradodukada.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/68290059247.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/fudopuzesewon.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad5918d0f---somowebabut.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/porej.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tusofuloladojupekel.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910135816.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210910220250.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1ac31023---warisavejegezetew.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/midomevexelagubudoki.pdfIn PDF document text
    • http://schubert-hh.de/image/file/75165929693.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/29175662505.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/86136342506.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/86014075328.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/13384197793.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/posaninu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+android+zip+file+downloadPDF 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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 19044 bytes
SHA-256: c76a697bda1739d00a89e8621e858703a314bb2c1c41ec113c21dac787aebcbf
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 10640 bytes
SHA-256: c13b6a78c7650ba05110608e5c2f9b4fdf4533f11a079aee6c9a2bf99df8f78a
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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