Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec72af426bcf12f…

MALICIOUS

PDF

369.7 KB Created: 2021-06-09 01:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 44397d5ec8063ca1a31c69fb05c2fa63 SHA-1: 330fb5c749c7f6dde424abda616af405bac57068 SHA-256: 4ec72af426bcf12f0953ab94a77eafa555b0bbfc1db098f101972b74026d3b36
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=dragon+ball+z+kai+dub+free PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20d8b8076---gevizulevulono.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3e80bff0---55768880085.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5df946369d46f9f1291d850e0761622d/dibifuto.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5fc604da---femujor.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9eb721cd38bdea675ab4ef3cb99ef033/durezefo.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/lufumogaziravi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kg78atu8b1fektipr2sjo8h49t/memutakebaputipemavowi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/damupapew.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9aaafe69e45d0cc88973514f445ffc8b/91505373395.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bc86b644---doboso.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ffcfb24b3---fupejedotarum.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a1d4ca18---18723166398.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lasotono.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/958ada2fe691f4e438f818d8efa5840c/jagozasugudosiloliwo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f4373384388bb8e28a17b239efa72ab6/15032437865.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fimorudunigalubapobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0003a9ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A9AC 154148 bytes
SHA-256: 2071833e1df2006dc5a8fe019bd41d6357f14fc21196c1e440898a39ae690916
font_01_sfnt_off0005726c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5726C 4952 bytes
SHA-256: e54525b043ddf6b26fbb9cff6e82bc24070460a22ac6a575fe929f1d338502b3
font_02_sfnt_off0005834e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5834E 11732 bytes
SHA-256: d500386f46195424d9244f6c64520cbad5c0b4f3cf87e7254ea6886612fb9876
font_03_sfnt_off0005a9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9ED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3