Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2b6c47cdddbe2e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 11:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d9dab1ff6a0f6f2201eb962d0a0be24 SHA-1: 581b0ddd601006e8476dbc49152aa06894e99320 SHA-256: 1f2b6c47cdddbe2e647a30234c63b3f4a0277194d547780d90810c1ea86b7903
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or applications. The presence of numerous links on disposable hosting further supports a malicious intent to obscure the true origin of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://be-now.pl/userfiles/file/73086297820.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6k4r0712q0orclul332j2bmc93/rubexafitatelovifigemo.pdfIn PDF document text
    • http://cpils.com/userfiles/file/2236121600.pdfIn PDF document text
    • http://www.toptehnik.si/images/rewibefaneji.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/93408981154.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/38478337378.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/tixuvu.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mabulenamuvomob.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613990eb7d618---72815370295.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/guredoritulipofemilexu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ca05a2320e889219e22b9c92a2b39dc/63788003980.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/konapepi.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/15873943148.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026c759129---ruvux.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/51089575241.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/67462326999.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-02/images/files/butameribokidezozo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/daguriduxosuw.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132392e2112e---2145582044.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/46749027002.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nogikererej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tango+app+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_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 17240 bytes
SHA-256: 5a846c90a2104af5c2377477b90ba0788a8d0a4222e5bcc4ba870b39328380f6
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10120 bytes
SHA-256: 5904a0611f8d14b6ddbc616111e2b25e3447cfa1ad518369eb426e02d3aea9bc