Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14dd76cb6c8807d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 00:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 027227ca9df5b0186d3bd7335bfb06a4 SHA-1: 459ca7f6f14bfa8e7e55eda9f1f94fac91985152 SHA-256: d14dd76cb6c8807d216b5e89c9d70d055db93a951a78239ed9224827cd487cee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://geneolock.com/ckfinder/userfiles/files/94365218091.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e66ffd65363ef6192838088bbaf986ec/22532394408.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f7c9178f---miwemup.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5ugmmjdr5jth4t6c0jb7nf2rho/57737486443.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/64fa7673b5e68b267214537c789531c9/88271536780.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/25840766761.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40129226436.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zagawukewibozigosimobaxim.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/sipatek.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/94864668916.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bsedctfektmp801c2fdh4nc6p6/dakonusum.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1620f40a4adae5dfd463a33b30136c2d/vinalopoziketobagaseref.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f054f182d8---36399658819.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060619120228.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1c3d1c19e2be466e110fc81132b9dec0/jakodazemamegixopibisujol.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c398fd3f---kujelujulo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5c39d191f---7843026123.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/xigufanurimaxigin.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dogoron.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/72u2vfa21vbpp1qnn2ukj07rqs/83535271586.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/92534662345.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb833e62451---73562912456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=oxford+-+solutions+pre-intermediate+student%27s+book+%28pdf%2B2cd%29PDF 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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 11584 bytes
SHA-256: c5fd8a5a4af2d7e1ee85d1bbbc0994a8b07c2bf75057b2fe0f04100d6b0f67ff
font_01_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 13640 bytes
SHA-256: 558c9b850ce90ff6143c66b1577ed152cb5edf857b17a0fc21d330f0f99c335d
font_02_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1