Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b193a56a3cd7dec…

MALICIOUS

PDF

87.6 KB Created: 2021-09-03 03:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 504ffd147e450f500b1dfbf5f611c06b SHA-1: 350c05a07cc3cdf9504263e80f758bb7b180d796 SHA-256: 1b193a56a3cd7dec900288505c144ef20aa0a4e590d9c08a37323380f97160dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or luring users to malicious content. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=digitech+whammy+dt+user+manual PDF link annotation
    • http://bephoangdung.vn/uploads/ckfinder/files/39067839450.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/94a1d63872ba345ecf3fcd4e3d91a48d/38846117309.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612355db50682---zogebusutexikaxinatuvos.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/55894143064.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0aa76e3db3f223889008b739db4e1a6b/90527195614.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c17fbc64a---5094470758.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/62681694982.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607373e1b59a8---lotojopi.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108082148351496.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424faeb286---samavosufobibi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/604c4a9b124e7daacad25bda5d83df59/vivesas.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/657eed2069125d93213436936b6d7b38/gatub.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f799ea260b4---fapusesuraw.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f3d310b153c65d65e376051d7d453da9/baxugusib.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/kajurezupopajisimifok.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c1faaf38---57495888289.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af5e452dd294b381a2d82a8b4bc9f8d0/tobawuj.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/somadumorunugazewijem.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bibosetotusojadafekemo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912b1b408c---domorowatubirodokisepeder.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rewadel.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/geiv2h32rk4t8vh3q68m95ua76/mawezowufejifejazit.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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 18872 bytes
SHA-256: 3bc4b8eaf29f3ec2b8d54b430b9eaca8da0f1292234d5642907d3daf32de5c5b
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 10996 bytes
SHA-256: 4b86aa7dbaa9a41e73637cc4510f9375fdfb03b3f92752ca17b7caa56212a009
font_02_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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