Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dc522524f45ed1…

MALICIOUS

PDF

98.0 KB Created: 2021-09-19 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e1f029b27f3292c39e3331a90cb35ff SHA-1: 563f9354509c5d41c99d6f463d20e9ed84d63256 SHA-256: 63dc522524f45ed17075534437675809ce0160a66e588e5a1a999e828f208b19
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier output further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://queure.ru/uplcv?utm_term=sengoku+basara+android PDF link annotation
    • http://biosurfest.com/userfiles/files/wajopipopewopezonopiz.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/67109822970.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22950097137.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/47423167494.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e16ee406---mowatujibokivaxema.pdfIn PDF document text
    • https://costarica4d.com/contents/files/64663902508.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdae71a68---24344812673.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/fagidapalale.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/patikolipagitito.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eqnbpsqq5mrr9v34pg4nju3e9u/60929105317.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109061727487255.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/9754037395.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38108696891.pdfIn PDF document text
    • https://dyaa.club/uploads/file/fedegiluvezed.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/minomewurerevajisuzobux.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vufowepavoriwudiketovuji.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/67946226945.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/fofilowiwena.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/69141227889.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/25891166902.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/pamilik.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/45704701011.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bapoxo.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/bakelerewinoludizi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 24036 bytes
SHA-256: 27421904d35ddfe1088f806a28545a3ff4dcc89d8890d64b53ce47aabe5fcdb0
font_02_sfnt_off00014c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 10684 bytes
SHA-256: 989afc402b638e00c1a64d910b0e8b3d1576fa4eb9e281287bb551ef9a841a67
font_03_sfnt_off000164fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FD 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426

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