Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c3dfb64e93ce1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 267956b70d7604e2cbf2d63cbfa3d3c4 SHA-1: 0f2477b235f0e02fcb1dc4756acd15118521d9e2 SHA-256: df9c3dfb64e93ce16919c3a62af6561ed0302b1b1eb4b12f85a84f234e76232c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body is heavily obfuscated, but the heuristics indicate a link farm designed to redirect users, likely to a malicious payload disguised as a Flash Player update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myparrotfood.com/user_files/files/72743816343.pdf In PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/nefoxataxisazalopeju.pdfIn PDF document text
    • http://asvpp.fr/pdf/62224286998.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/murudojipokonodisok.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wutunigoxulugoladeke.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/zurerakuboturubewig.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/fidilunakojinaja.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/99978212936.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/muwijimurog.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/22799774613.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/98036532680.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c27a7223e427b13802840fa68f4f3e66/nutogobobizesuligab.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/94045626921.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912005336.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/98346351584.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/wapewawi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302b346ddae---77987759934.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/buxolasobijedevodidex.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/digorozewibefofeg.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4ae4cb52---zaxolabizefibekajewusa.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kasubax.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a39q0c367bvcs61va7t6iau7ed/mopisilebezowezumarepo.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/mopazewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=call+flash+apk+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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 10384 bytes
SHA-256: b31b7a1a056d3e1326551567e0061a2ace6be23b0ed37b672efc874ae8ecfaea
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 18728 bytes
SHA-256: 70596e1b3e8f575e498eb29d8289bc89e1850c31114b4c684f9b1e68aace74e8

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