Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad652d16bad3a6b6…

MALICIOUS

PDF

76.2 KB Created: 2021-07-01 10:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d4d40ff069cb918113d171ed455e8470 SHA-1: 78c534f7783357ebaa7d02bf3340c46ce42c1c83 SHA-256: ad652d16bad3a6b668e06b9e8643cb244ebffb5c3d7c027430346472e80baf98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on compromised CMS upload directories, likely as part of a phishing or malware distribution scheme. The presence of numerous links on disposable hosting and compromised WordPress sites suggests an effort to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://menu2uplus.com/images/file/kafozixunipomu.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2e147fd73---29903826281.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/96665122740.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/80988203868.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9707b63126c838d138c594852a126db7/88029241420.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d32ee2ec9302e2cb41ec8becdfd1949c/dexirutezugodub.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/jatexoguremobeg.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e1e038d2846bbc28d082da427048f77c/55259807117.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/nukesipotaf.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jerilemefopuvodigenum.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ec535626f---44992988756.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d71c0be13d---jutatebikopikudutijele.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/55746407566.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/88895798441.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e67c4f316---lefiraledaje.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ra5upnii1sgol9dlnau9l3i5fb/60500789600.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/zefakubulimefufome.pdfIn PDF document text
    • http://falerisztika.hu/tmp/51921480824.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/gejorajesilaf.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607974fdc4ba9---20533693858.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092052c2e78a---73634850823.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/97954062524.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b2e41b6d---83097052292.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/fafufuvaxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+to+excel+online+free+downloadPDF 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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 10732 bytes
SHA-256: e0d2ecc12352f3e607021c8286f6d80dcf502b2c7cf2bd03baa483e5d322779e
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 15972 bytes
SHA-256: e876f85e21bb1410f4d0cdad3db63d9ec48a180318632ebfebde5b4a40166732
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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