Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c728b1e6378deed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 08:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e65d443231f238c64a2466e851f32037 SHA-1: 24106a2e3742394846e41885586bec0a0df563dd SHA-256: 3c728b1e6378deede10cd9d6ead47d3f262b3c02420dd6bfb7d6445e1115050c
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute potentially malicious files or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://menu2uplus.com/images/file/wobuvewigatuvobujasej.pdf In PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/rezumidupadetuf.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021082817211373499.pdfIn PDF document text
    • http://geodez.com/pliki/file/94275653425.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0d353366---jiwaf.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/bizudufo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece996752f---84883773774.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210812180953.pdfIn PDF document text
    • https://sce.tw/uploads/files/61034ed63262a.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/48313466921.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e7t5cjhdpdg2srnh9r3r654or1/sutesuwenegabaz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e71d706931---9161635947.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenapuletexo.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/jukopipetebigixuji.pdfIn PDF document text
    • http://mesterek.net/tmp/pibabufoferofutif.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e5bbe6cd37aacbce11725d6bf9fd6543/danebab.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/nipaver.pdfIn PDF document text
    • http://medrea.ru/upload/files/40394325177.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607768ce5db0b---bomemum.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1fbf4ee19a5f9dc3710cad07c5eb506e/lumidurituzufonepumeza.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/pikezupuxipizalolane.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/976ee1d4b4dabdbfaf4e5c8aa9991a58/sufikamagax.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lilikavu.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/fevivipujezudujerirala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+lucky+patcher+versiPDF 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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 17208 bytes
SHA-256: 1710c8b1da5ba72d89865a8dee4492eec7fa644f7a8ceba1472ee369e8525d5d
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 11068 bytes
SHA-256: e478edb2e0217081008c2b4baf2aa08da282385dd843d32b64f78e7eb38fc29d

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