Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2c0f225c447d6f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 13:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24a04f22bb6f19ca6d6fe1c4759be0f1 SHA-1: 86711627b3b762161d77fc1d86b3f072ac1a3ba2 SHA-256: ff2c0f225c447d6f3f85496e8e2c671336bb93f8f70081e4a3107bbef44f31a2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage and disposable hosting, indicating a lure for malicious content. The presence of a QR code lure heuristic further supports the phishing or malware distribution intent. ClamAV detection and ML classification confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dakov.hu/_user/file/14540356110.pdf In PDF document text
    • https://weeb.nu/userfiles/file/12646270352.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pamaredenuzaguvuf.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/betujiwoxitaturizulusuzim.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/87805190030.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16136629125ecf---90299443074.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/giwulelipijibok.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/91542351565.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fudipaxabedi.pdfIn PDF document text
    • http://xfswchem.com/upload/files/vinizigetenogurubipenak.pdfIn PDF document text
    • http://hingliltd.com/userfiles/8742936380.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/73442143208.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/15218586836.pdfIn PDF document text
    • http://temple.mo/userfiles/file/41322512001.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/acd17bc3c21267cacbb5f7592331a135/kapeji.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/51064588537.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/33137815372.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zitujuxosunudafubide.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zozaziwopizofibewujag.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b33e8edcf---80798839363.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/55581924057.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/47040020173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=qr+code+for+pc+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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 10400 bytes
SHA-256: 77239a9031f775a3a42d65d01f4199e07ef46e7e70c2bfeda7de3eb865165cb4
font_02_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 15576 bytes
SHA-256: d5a5ba688952d02f8340e6c7a6f9ea694c07266576e4e5d1c88ba3be80c7d58e

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