Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6805b9e8d2e875…

MALICIOUS

PDF

96.1 KB Created: 2021-07-07 00:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07dbfab0cb8e70a1786a79992f15b472 SHA-1: 2165c1226f004b47f15d6a0e4ff5d46dbbbc68c3 SHA-256: ea6805b9e8d2e875f7bc14b6d1f38930e7e9a0f5d55fd53a33200a4a1fcd07cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://5udua.com/contents//files/19840439529.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608badd6666f1---7771127210.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ab4bc110871fc15c0843ca9cf90c37c/80410511589.pdf
    • http://aps-mes.com/files/file/lufizadudotif.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c1674e95---82715829682.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/821c56b3235b11ba476d563cf51e23de/monirusabizoluduzi.pdf
    • http://dancephoto.ru/userfiles/files/negenividuxarokoru.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/klq76d50rdgn4unv72tt5478t8/jixegedujemubaxex.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u8beab99821rl6c365pbmunha3/bitepibenefibuwob.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7tpqe74r593h04648l4n587s/niboxinefowa.pdf
    • http://retco.ge/ckfinder/userfiles/files/makev.pdf
    • http://hungthanhauto.com/luutru/files/66118619042.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867290450a2---17525985038.pdf
    • http://nessium.net/userfiles/file/1734444285.pdf
    • https://joebalogh.ro/imagini_ws/38888235896.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98a103cac---96123826837.pdf
    • http://urjabatteries.in/userfiles/file/12658987250.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f4561a3e---22744411481.pdf
    • https://himalayanthailand.com/image/upload/File/dodisubax.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607367bed65b7---kafoserumorovanawuxale.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6670e49e---98443548027.pdf
    • https://hinodanang.com/uploads/image/files/bexarisoze.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/df05776e804471051028f5aa9324fca1/kiwumelusopinuribekasogi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=naive+meaning+in+marathi
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea65.bin
095304c8255ad5e6282fc57721b61516dcad456eb9c7d9304f51aae8340c6ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 2620 bytes
font_01_sfnt_off0000f5b0.bin
4cb9275eebdfc75e9c689438bf7d3b34a7ca4cf08c87c4c26887346368beb7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10264 bytes
font_02_sfnt_off00010c8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
font_03_sfnt_off0001249e.bin
cb2e91515bfd7f0ee09c4f74ceedd758a9de84117d38647779e9a0e4c16bf82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 16672 bytes
font_04_sfnt_off00013c63.bin
8b17ea87ab8d71b82a9b7836bb8a84e47cabb5fd8d38ff54c81303d10d2f4efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 20660 bytes

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