Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfde062a30ec0164…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 13:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98897ca7f27e05137689f4335779d806 SHA-1: 9bb4849ea6497709b2d399f40d0dccecd0ce9ef4 SHA-256: dfde062a30ec016457331a28fcccf3ef8889dbbbadb4f6443109f399debe5fcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amsuatrust.org/survey/userfiles/files/takafilogosomexinor.pdf In PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/50626804791.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/48609985296.pdfIn PDF document text
    • http://zaiger.ru/img/file/40201988935.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/49442948225.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/sajekibimekukuduv.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nuwetofiwegurajisisofo.pdfIn PDF document text
    • http://sushibelovo.ru/files/porapubopabupaziverago.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32ba4da5---silawejubidupomob.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/48716864411.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nitutibumika.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/98538575522.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/rimuxozezaza.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/78377543148.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090222070872.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132532a0bc5a---kizejuwamo.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/13760041157.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vs4ev9f11jd2cldl0ksjp8t1g2/55463732306.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/34826663601.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210908040820.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/36874123686.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/77241388838.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/45a42c0a6df26e5f1375271b35264457/35626608440.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/gemapativemufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=five+nights+at+freddy%27s+2+download+pcPDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 19252 bytes
SHA-256: 66461828ca734dbdccd1f3ebbe358338d8426b30eda82cef7a978ee4c5b41621
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 11296 bytes
SHA-256: 6599e31e1c10e138d34a2e2a10319c3472171916c7b9fe31097d1085825ea912

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