Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b2833b3d68f01a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 16:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc6aee7545163a76f7a682833ffac9d8 SHA-1: 9f661079076bbc57e6653e254c8aaf3bfdea60d9 SHA-256: 93b2833b3d68f01a8be60aea6c21a89cb3e96a51f64ceb2725153c2736fcc4e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware or phish users. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=xvid+codec+download+for+mx+player', are likely part of a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://smidgel.ru/uplcv?utm_term=xvid+codec+download+for+mx+player PDF link annotation
    • http://1yunnan.com/ckfinder/userfiles/files/firomu.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/88012632141.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/11366192352.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/degezibelukopadojijuv.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee43ea2f48---nukufuvegazotiva.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/66534618392.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51294377916.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8aba5ecf---40663742161.pdfIn PDF document text
    • http://wohingltd.com/userfiles/pabagonevij.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66395478424.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/21455990990.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/59410327560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a463822c5---24471887108.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tufivusoviwegapelikofani.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/bukevaxil.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/vajebo.pdfIn PDF document text
    • http://schokofontaene.de/idata/11573165647.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jikanuvuzagugifefedazevo.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/61653347375.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/34736389903.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tupamowewe.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/89721146563.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/poxozotokelenesuge.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/39722899540.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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 10888 bytes
SHA-256: 18be283d63919d73a5f26f44f1a9346869f08f38966cea6ac0e90b6ecc1c36c1
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 18804 bytes
SHA-256: b8081c70af99bb1dc9d4463a16cacfbace6fa33f2aa1281f44d3535a576c4339
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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