Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a48f7f781ac8ac1…

MALICIOUS

PDF

145.3 KB Created: 2021-09-06 07:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab190cdad4ca9db730d7315d0dfc7304 SHA-1: ea86f7249474e1f6ac6be5c6d331b9a651d9507a SHA-256: 5a48f7f781ac8ac1db99353e72c0687db4d3d00668c9ac0ae407899e8e3bbbeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious PDFs. The presence of external URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://mecaniquekd.ca/upload/file/94001946479.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/29375777700.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/22839914688.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ad941f2e8---21297351088.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/88542105695.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jiwizafulupom.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/89343440657.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/muxibetebimek.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/95172677884.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/60327513949.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/67991304681.pdfIn PDF document text
    • http://dr-temt.ru/images/file/297080366.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/wepivinalikaw.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/38167293673.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/27863550438.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/98464072691.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sakuworixumusisa.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/8817150913.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6686998b3---33584535281.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0296e2352d---29935770701.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/svmdrgujalobvrmuskig1e85l4/98134778647.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630044930.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zujujodudeki.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/dusagofaban.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3bac552fb985e69dc5955bd8d51af4eb/36879394740.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/17269603178.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/vuwabufidekeviva.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843211a36ff---53883732924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=atp+challenger+calendar+2018+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_off0001c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C85C 24108 bytes
SHA-256: 9b967e30b2339f16ff3370dcc1280a20dd8a39644f7e0645cafab13b1241bd82
font_01_sfnt_off0002053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2053E 11000 bytes
SHA-256: 1e00ec410122b205b600819d8f4d20af48690ecab26bf4bb786ba30c73923bfd
font_02_sfnt_off00021eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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