Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcdf73ed30c907a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 20:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fa225334b0d3cb9b80052b08e6ed5cf SHA-1: 80e0d0591d826b288ec3a98c5dfebce52402d268 SHA-256: bfcdf73ed30c907ad6e8367618d62d0cbc64d37df5d7e942c8c9f54c7d4c0e69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage link farms to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=appsc+group+2+results+2017+pdf PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd6253831---70615344663.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16120cfe7d843a---30813990197.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/59154672470.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094db2750a57---fisupikakunitusunedulukad.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/fujebuzojesosokaw.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadb4d5d3---bozip.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97eab5bc6---32706004364.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6a7ce3482---55399923412.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/rosizurakimidibemijib.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/lolaxajagemediza.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/fajezimufopep.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/10016681588.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jeviworovufivunifasav.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xugapipigepegubupidatu.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/potimatuvox.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nivevudaw.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/19498885541.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nunomeli.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/15236181232.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/20131676436.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rdlkgnndccnime9evfl7dtfof6/67372915111.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c50b5793---bukivogixawolumadopibof.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/mazubelu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/lanibasud.pdfIn PDF document text
    • 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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 10860 bytes
SHA-256: e5c400c5a680a9bc6453733e3356bccf71887aae828cc651f7ebe7e30d777c7b
font_02_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16728 bytes
SHA-256: bfa60e0270944894df3651fbd96796428867a5a5a567fb5255b9399ae050bd09

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