Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf537775cb2dfa4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 13:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b39a3f006ffc06fa5c77b90c1519796 SHA-1: af519b5ec5cf48a5e7e575a585f30e744c0d0f92 SHA-256: 4bf537775cb2dfa4245d23da321dc7f2895d42acbec12aa0d0d753230046d058
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://opuspointpartner.com/ckfinder/userfiles/files/85073234371.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/510bf678b0f25ef5bf2268334cf358f3/pesulolawevanamoseriz.pdfIn PDF document text
    • https://people11people.com/uploads/File/36808882416.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/86967915183.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/80730303506.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/811k3cbjmn7bfd3v8f40aujij9/wuvebevabus.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3c3d74170---fitaxemurodotavol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9ace9774.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/918a27873b3251b5d07a6ca2b16eea9e/lowalavodawexajubetevof.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nolakajawugide.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/xiwinelekirozaki.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210704095648.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/66947439376.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/buvaxonefujunikakoviloxav.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60293482334.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/pofonoguvu.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/35896522168.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bepijazufate.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/gibinog.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/18231896826.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a61bc62e661b5ae013890026f487098c/muwafoduwewoxeki.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://boathousebrokerage.com/userfiles/file/38827494629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=iso+10006+version+2003+pdfPDF 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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 10836 bytes
SHA-256: b323b7f0d28da2b25b248d2814ef74df5c30823340bafa2e08e2205d1991bb9e
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 17888 bytes
SHA-256: a1fea9fedfd785362ff8dd32f85a2e94afabe4e7e61e296749ea43020514e4c1
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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