Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a293d6dfd6cfa7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 12:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 20287da9fb29a8ebbb6d961a0d7af1d0 SHA-1: 3c4542a1ae60d57725177c4d602ec23823a6fa41 SHA-256: 39a293d6dfd6cfa758f49ef9997cb149c6efc6d365d3d25fa7144f7a72c0b065
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://barsugo.com/ckfinder/userfiles/files/sewikavomasopifibudutipu.pdf In PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/jimuv.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/87839806568.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/21468426180.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/xanolovudagopunun.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32599efc8---47051206493.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c24abb2a---fivineluvugalumu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/linexufig.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viruwev.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/941d7f672ca645b78cd8356a5b1a5fe4/dokuwovugog.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608270012e6f0---zopebiwaw.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/69017191548.pdfIn PDF document text
    • https://kopari.hu/files/file/zazez.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4b4592ba---gufotivizididu.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/piwofegaxe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110b13b8c704---42737665104.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/51103162718.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021710818421058.pdfIn PDF document text
    • http://shopabrang.com/images/files/82763693619.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a6f215c836bb147433b3fe9599901677/33369111127.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/27347565336.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5799cd160ed1ecaa2de24f14fefceb3/puzixeropununew.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xanovaxejuvujudifuloxav.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/95978236513.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/85839082438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ncert+class+11+accountancy+notes+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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 10764 bytes
SHA-256: 31a7fcb5fdfd5f160479fccf69ff85fc912f1d3cdbae0425fd5354a84597eec5
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 19068 bytes
SHA-256: 849fb48b1a5e91ba8ff63b94c57facff6e94e1117e001c1fe47018b0f6f72052
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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