Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ed46883bab728…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 11:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e519eb676a1e8c9bf9e566daaee1f59f SHA-1: 392b15fa2e191d35823c6388ac6001aff92ab4c8 SHA-256: c77ed46883bab7281a6642f79b5561b3f730606cac31c134c5d3164858ef1f2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://xn--h49al33a2zdp0eo1x.com/DATA/file/20210906022920.pdf In PDF document text
    • http://etalentlink.com/uploadfile/file///2021090401245813.pdfIn PDF document text
    • http://scsychem.com/upload/files/fotukitote.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/tukidosamogiwobuvotuzuxu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136398153bc9---73669170886.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tunebiv.pdfIn PDF document text
    • http://arsvet.ru/img/upload/xanaxikivimukafar.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/13844091162.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3e3c657a---kirutagawawedezet.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/bigunibefexaxutu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/66852527992.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aa1582da---32901315550.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/20720624624.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/57579880528.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/gegivigugedanononi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/supem.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134116ed068c---nanukifiv.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nabej.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kowuwokaruzutow.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/57841210058.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/66039296486.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/xipimuze.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/xajeveba.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fujiweta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+vs+capcom+games+for+androidPDF 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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10924 bytes
SHA-256: 45a5c815bff47e512b95f98fa07d10df2c0fabe518202e7194dad8180c1275c1
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 16664 bytes
SHA-256: d0e76b2dca02c48d8e607bcb21f362ef1988cb0931795f0620f2a23d50b6a2ec

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