Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a581c2490d93496…

MALICIOUS

PDF

149.1 KB Created: 2021-07-02 22:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b3f0c8a4eff89a2947d79f251636574 SHA-1: ec1ec5ca5775c8cd093d1dfaf0c3265035d345fe SHA-256: 1a581c2490d934963487c146d6cdb0a3746285c6ebed61a1dfa06fd0e8033a11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/673bc62be51f6a5c4357d9e5802ffd78/43596989037.pdf In PDF document text
    • http://camionespanamericana.com/userfiles/file/sozorilapu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7f4cc90e3aa48643619af5ceb6ad74b9/9272067590.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m284bdlqj4aanr04aec6ie45ea/84953489858.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13c4a44cd---rusavaginalewavefir.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8tk1af7njb195ur8fjfk9r39cl/sisiked.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722511e6af5---nijus.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ef72b40393404bdf6abf5d7fce612b16/55089871066.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/tuvodixuzido.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/3398964609.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/nexipuna.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/129772920e934c4e340e5f4a10b5f508/72392415538.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/34541731132.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c37eee467cb---foxedurigawosoguwutik.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16074f761a89c0---38053579343.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa91d3649---moketojugetelituwoxuz.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/31651081271.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9f410e39992fbd7d4da311a0e713f87b/keruvisemon.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/28218165981.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/51342184572.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6695ae60cedbee7d8a2ba819ebe3a7c5/mimubijatagamiriloxalul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=live+fisting+camsPDF 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_off0001d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D02F 6892 bytes
SHA-256: 5090d224b4ed310f46d5ba3a24f21cbf7ec83a4386cd946d9f0f36abf5041969
font_01_sfnt_off0001e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20103 10436 bytes
SHA-256: 88a4efe991e7c1bd1862110ab1353e5d3d6c8157e8f14e31087937872d2f4b7c
font_03_sfnt_off000218b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218B7 17504 bytes
SHA-256: d312b92191ed6db9bcb4850da306d25870f5781b2b77f54bf959475a3fbe0dc3

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