Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc0c3a3e38bfe3b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 23:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e14964619dd3eafb17d1d73b97ecdfa9 SHA-1: c83d8e46d08aabb9d252df8422616e9c9edd6676 SHA-256: 8dc0c3a3e38bfe3b96443586a0ba88ec4e1b24edce0176fa70c78573f5ab020c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, with several URLs hosted on what appear to be compromised WordPress sites or disposable domains. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

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://sswjeans.com/files/58720280097.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/xumofumojonenanor.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/toguzozujosiru.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/mekeb.pdfIn PDF document text
    • https://akconta.com/uploads/files/85620569252.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/powadasowikixonub.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb18c0ce09---sijuxipufugu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/24244642680.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/33042801095.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210913/1245059790.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/37434712512.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/18307460508.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/2293952385.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/visubowumewomexarikuse.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fizofi.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/tutaligowo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135045616b4b---tepewem.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b095194f---jusurovinakuji.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/72511113323.pdfIn PDF document text
    • http://vinmexindia.com/uploads/zinebulifamitafiwewepum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3qphiahgbed14t7q4oks7d3cpm/80367798405.pdfIn PDF document text
    • https://everestart.com/images/stories/file/35230154193.pdfIn PDF document text
    • http://carbontuning.ru/file/80044135190.pdfIn PDF document text
    • http://elsped.hu/files/file/sirekeralexiwadi.pdfIn PDF document text
    • https://fishuntpesca.it/file/50804683804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=different+divisions+of+the+nervous+systemPDF 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10692 bytes
SHA-256: 9c2d02ae9240116e935456287ed17148b49315530e668da5a1ee3ed471d6753d
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 18000 bytes
SHA-256: b17b4de763ea5a8cde631867eeacd4e9221c53bef02948afda9dd5297dbff22d
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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