Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c07f5ac9f2a0d2e…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 09:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5cd4a234168c3bde57fed5fcd4f0f7e6 SHA-1: 622da77f407369f8add3a711e75ba837a41d74ed SHA-256: 9c07f5ac9f2a0d2e7a68db384f1fd3fe2d0a3d564c8a16dad5b8bfdd5b20df2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bljgfgoccof851ve715fg8qpk5/13477917632.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/00e19f8c81e460ce6b762eeddacc223f/vusajuvadiluzuxesozipope.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8d551281---kagagep.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097513dd3b5a---zikuvovusapowizejaralip.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/42027812969.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gozak.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/83793815538.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4256cd814a---32661441300.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9e26a821f09c3c3059b9e1910bf2bce2/43599642945.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/266v3iq95lov80lp0nvvekvld1/welapadifaku.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bifemamitake.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4o45acpui132o1uoi4uuhbeo31/71147130687.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/21006678203.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/8657132376.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/13490294559.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/laxamagejofe.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/59020033544.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e07b3681---96982613754.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c844a725a1c035711c4baf38e3067cb2/79695947465.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a81f5900d---42414842795.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757cab8d0b3---25241823424.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ae25ab9aab7b847f396dabddf6550ac3/8490309573.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5563afcbc655373421babfd4a9a2141a/bizedubovupipuxubiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=autocad+drawing+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 17532 bytes
SHA-256: 3b98ac78ca62d3bffcde0a1237e3e3ff5e4c5fd327a1cb5dffec18305e04f2fb
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 10660 bytes
SHA-256: 06dd6f4d9b19bc837491e08a840ebaaaeb49675a78e75e652061b8dcfd39e45a
font_03_sfnt_off000133bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BD 18276 bytes
SHA-256: d74ee4e260cf5045346526367e6c41f1998b24691f0b746d79412de2e12eddd0

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