Malicious PDF — malware analysis report

Static analysis result for SHA-256 939418e97ac7fc98…

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 07:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aea5bf5f1396cf702bd9ef8215f1ba81 SHA-1: 09b3ce8433f4a4f8eda033d984afdb5c4996de90 SHA-256: 939418e97ac7fc98bc653f1e1bd516f7279794862a69a3d7c2414d08e76f0797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=best+pedometer+app+free PDF link annotation
    • http://isagenixmakessense.com/ckfinder/userfiles/files/wutisaxakolavibuva.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/63867408469.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/fatelafifem.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16149806824b40---1671194072.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fh1r2t6kikanht4tv81v3befrm/nanobis.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/7240464293.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/21566449778.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/verumejufeb.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/48242258903.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/85941965280.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/13204456039.pdfIn PDF document text
    • http://1careglobal.com/upload/files/20935880635.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/11370198125.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4e50b0d4---lonozatanomovemuguki.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/nizaziretifedojoto.pdfIn PDF document text
    • http://nktrading.qa/file/files/ruvogisutofenipadov.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bosapetazorizokufomufiwet.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/28507999778.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/lepotazu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/12d4133f728536e18f601fc2db8b93e0/95340468973.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/22388719657.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/doxanopo.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/solukilila.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210907125901.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/novasimabubaxulononoteb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 17920 bytes
SHA-256: 9bc651531adf8bf9f091a5c63f7bbe6d6b51708900d2b3088cafac56f904a5a8
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10468 bytes
SHA-256: 8f96a25dba4a6f12086aedd49b1ba783957131bd84616e6e5f1ebd0ae2a55ef3
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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