Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efa2cb562a0c2dd…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 699245f4eea4fddcab3d6bc4e0673e68 SHA-1: 8d1cb19f4a24ef0498759afcc35bdca8055c0a0c SHA-256: 2efa2cb562a0c2dd1e06ebb9e425f772dbe2256ff6e543e717ad8beaf0caff24
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, while some are marked benign, contribute to the overall pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://rotarylaspalmas.org/documentos/file/63543625503.pdf
    • http://magogaralbamoble.com/galeria/files/82256313420.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/64b99f7024b3e8a8529f06ac7cfc7b18/8020062075.pdf
    • https://lecapsuledigian.it/file/59113982115.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a3c66254a10005fc4441defec051c939/96301358515.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a170e4ebc0d9d6ccebb4e6269c8fbacc/kotugonabudipi.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4tgbtjoobtj4pl443fqk5lo8cu/87656231787.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078930866814---61895586588.pdf
    • http://inventory-acepipe.com/images/uploads/files/20166446835.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/uokohdq3pdt0aneork4i1bd0qb/jemumevubukuju.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609233359b806---57408495867.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06b232c13---wepipidosezime.pdf
    • https://aronabritcan.com/userfiles/file/25243962862.pdf
    • http://www.urbanwaterways.info/files/mumavunuzepiwexinad.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c7e8b163f---90272147963.pdf
    • http://classtool.info/upload/files/46446194.pdf
    • http://fence-alarm.com/userfiles/files/kumalopono.pdf
    • http://bitite.lv/media/txt/122/file/70870970325.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdda6c1572---ripelozinogefalosuwes.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839109de10c---18230866631.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/66536958772.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c6a0c39383a14d8d52dd790d968cd8bc/40480628075.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o1u29ajhimpfadk4ms964ht7jo/febatijiwatojamunutovor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+square+root+of+non+perfect+squares
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c1.bin
ab2568333787251e8f45d06b858d73b5df894602814f117f6b0b2ccbf66e64e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 16468 bytes
font_01_sfnt_off0000e0c0.bin
cc5aa0a60d72f7724f1fcd5ba5b645e97f95ba87be4db3d9888fc944cbc86846
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 10892 bytes
font_02_sfnt_off0000f9e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
font_03_sfnt_off000111f7.bin
feb7bfd6ce5ade642f156a25dd6adab90eb3eeabec8ceaf5ee9f6a988bd834cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 17848 bytes