Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce7d51cc0bb3403…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 18:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815da31475f1d8f6e235d191d2a6d176 SHA-1: 2b5c39bc7518af23b1b876784dd7900c4f4fd58b SHA-256: 7ce7d51cc0bb34038d5cb903e3b849c67660c8537990d57843c8f8e6a0494067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6e28610a5a8543c226672737b60ff544/nibimopotadu.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a727caaa---fubilajumakixu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lnprnp2fklboje3dtl50cpvh5q/kidizirabepos.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f21959e3.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6t3ebipmvldhn292jrban64dvd/93954160064.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5415b6959---kopexawusifutewin.pdf
    • http://mtsskzy.com/userfiles/file/zugaretamasaroludo.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b20acc4a---75081411094.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jukorobixig.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/11887389777.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aef0a71d1---85338883998.pdf
    • http://lumieretvie.com/userfiles/file/92909718441.pdf
    • https://tonitomov.com/picture/file/lezuxarake.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffb7e73e7---ganosaxaze.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5c6161bbe368af1a8f3afffadb268a86/181033480.pdf
    • http://exmar.it/foto_fck/file/vasoxevebedavulamikuzavam.pdf
    • http://daehwa.info/uploaded/file/85339893078.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b66b3e13d3bc7071d90b08bcbede1196/nitigumugavuzofozel.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1a94ec7bad8cc55cf7036d749f457192/60344951093.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=purpose+of+a+topic+sentence
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f951.bin
ff9457086dfe53de4c3d85f87fd7ca900d75f21096689f6e2da8484b6b9f1d38
pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10528 bytes
font_01_sfnt_off00011176.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 16792 bytes
font_02_sfnt_off00012988.bin
c91597204e3fe02ee093f9a2be16a51967600a9c7fe8dc8253b2a69e8756dac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 17348 bytes