Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faa19ed4f45dd2a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-31 16:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 21dd09305a86d8c98f103ee7cf2ccc87 SHA-1: 1875de790cb9b039aa68b962ccaf77120aa9f2b8 SHA-256: 8faa19ed4f45dd2adcc0e43bbb3e677adc46427006e1a2a76c11337a423c8d94
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://balade-pierry.fr/userfiles/file/fedukinamu.pdf In PDF document text
    • http://alkanboya.com/files/file///2866382836.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/41e128a59876b2cf8b4e27b2e61f452c/savadomarotodakugulag.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/wekutuvik.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab273ee5353---vipawamisenemidexugodareg.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/12040b160733109c5871a9a65995944f/wipotewubevidedikirepak.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kunagap.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gt821jnqsf5a135f2qshsaluc5/muriwop.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/77facf137470607b5c165e486f03e74c/99851140889.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086335636acd---80717318258.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/84432531663.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/70545263089.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160703655bdddc---42082597235.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/vemefegejerafotepox.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/91tpokesr4uubqnm07gp41deu7/zazuzofesokeregukizanotin.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a54087c2d20a26e26ff0eaf4db2cc591/35362020808.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/vefotadaxomerebup.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/81259586380.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/disexedu.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/vojux.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/738340550.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/23373408957.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tonosabujitibolubox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+svc+tire+monitor+saturn+auraPDF 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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 17596 bytes
SHA-256: 8cfe92092179d6039d76b9b098c69b73d896f5023a05d263ad93ac7f36dd5297
font_01_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 10588 bytes
SHA-256: 388bd83ddc84d27f362e7a960767a7ad66b9fd586537a83e4dc954e18ea1cd14