Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98a22016a8cf779…

MALICIOUS

PDF

79.8 KB Created: 2021-06-08 04:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4a23a3271debdb9f12de5ab7656497c SHA-1: f69458325493d9a78aa9ac0f4899e827564569c0 SHA-256: c98a22016a8cf779e52978b3b552233971aa0ca17b83730c1b469018dbccb85f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, disguised as a song download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the extensive link farm suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=chori+chori+chupke+se+aayega+woh+full+mp3+song+download
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f500641ff2e14aaf65c3db9806a7da14/roniwojurofexenov.pdf
    • https://bestofbucerias.com/upload/file/zizik.pdf
    • https://artbynela.com/uploads/file/70407165565.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d87a80a7---58883493571.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/324a40e811fa20de36620561046f846a/4638681675.pdf
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d4b1827ddafb16d58475b66bbb4503d/40804886758.pdf
    • https://aprilboya.com/userfiles/file/27293141643.pdf
    • http://bi-acaovo.com/upload/files/rozajotodefazulepopodage.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4509b81f062d104790f0e186b5e4b2e5/18840685273.pdf
    • https://asset-books.com/userfiles/file/vepelepitesiga.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf985eb81---179895618.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef890b355---pugafa.pdf
    • http://fitsiluet.cz/data/file/sozep.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/ditexesunazo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89c72fae2---dasezufedizifafologen.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2f5ceb64963e2f4e362f203d9439f5a/46082359088.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3r025t0njestg1f35125aedv0t/rumamoronutiwasupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb9.bin
16b9ef255dc9e28a3a3b997ab3807e9b7e7dc7345a0df703265d69ca40ee521c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 3984 bytes
font_01_sfnt_off0000e9cb.bin
491a1efa577c3e8ff3e9096dd05b4dc8a9ee9c0f5949ad60262e78fa896be93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5896 bytes
font_02_sfnt_off0000fdcc.bin
e411ce502ae9bc34c194844be2ecaede58d1919a7382a4d2325c331064f84f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 11132 bytes
font_03_sfnt_off00012409.bin
9c925c9982571ddd13f4485196c4bc17a4ebea608eb8812789799f3acc84d320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 3072 bytes

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