Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fb752554476346…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 07:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 23faa5502bbbbc7bd6a56059bff3ef22 SHA-1: a67097bd27572ad11aa82bf54376079f0c46fe6b SHA-256: a1fb75255447634676d035bd0d168a121e41c7aa17dbc4ee9f5b7233f4acb40d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of 'SE_MFA_LURE' and 'SE_BROWSER_INSTALL_LURE' heuristics strongly suggests a phishing or social engineering attack. The document likely directs users to malicious URLs, such as the one found in the PDF_URI heuristic, to download further payloads or harvest credentials. No scripts were extracted from this sample, but the embedded URLs and lure techniques are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=how+to+unfollow+in+instagram+at+once PDF link annotation
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f3d62c48b227130099f935021cc92514/8324967832.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/9472a50b419be619259786a9a3163624/75244234066.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/54806002344.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be6ec8e6c---legafelozoxuzoxarapididin.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8197f0ba5bbc84b25d8a8b7e0aee4aba/88173543225.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d0a63b25---5000159983.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/48586856c13bfe6cd8cab62493ce75a7/37882017182.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2b2ec695---63470226417.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/kifedulemo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71f75932f---26297325500.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/56091908258.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d006aa14---8730721867.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7419b5d3e---75487147364.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kr1e09c3c0fr84ib0lqdji1352/1651449963.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///1195678622.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/963ce959d81ec919beba3d3e6bc29845/bitopite.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/8627104253.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/vimasuge.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4bu244bb3ftid3ps14olk9csjn/golufojekunasosegoroka.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da438bdf47a---11514571717.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///foluzexofofepo.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 17904 bytes
SHA-256: 2bfe4b048929b53fa8e77b8eacc4734f45a7ff27ce02f6b13e013f800094c7af
font_01_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 10856 bytes
SHA-256: c580c9bb3ac2d06a387f6e1849457b0a88e8b2b14dce16c212971ee981c8aedd

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