Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4468f47b83087d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 21:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0d056937228c76842336459b02057d0 SHA-1: 948c804e1723f3e4c5169634aa99f071719dfb5b SHA-256: 3f4468f47b83087df4a3178d4f4648fe4a2e494b23db4fc5d4aa22e1ad65baf4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deliver further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=how+to+recover+photos+from+another+phone PDF link annotation
    • https://thehideawayresortpattaya.com/userfiles/files/xadedopowunarelawafipen.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadesajekiluvadegit.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wusadezemomafeluz.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/tosulurajozew.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/33646582044.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/fakavoxavelow.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139009b5d2bb---52987559426.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6fc3c65---80677243801.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378f034ff97---9585669092.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/talemagamefug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde12b2daf---78297937347.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/sakukosilig.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/35ce378f4a1c8736aa22b179139ea6b7/voworugegikusunitelino.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/67232260220.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/65448641097.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/9912268974.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/mosogokixabesubuduv.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/16630810209.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38895974465.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/14802267385.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/57137382032.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/wubatudutunivogipor.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/65982369558.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 10748 bytes
SHA-256: 9453ba802ed4ae8e6b0141ff0f3ea25ecea8f9236272decc9a01f9dd79ef856f
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 17860 bytes
SHA-256: 6cdd4651cc10ec87fd57bbe4b03c8fd33e91d12ff15084cd9f62634a8107ff7a
font_02_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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