Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b966e4491ff1adb…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 16:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ad2f2d92395ccf3b17d5acb63798d34 SHA-1: c2304523cb48e6fa0bdf0cd82d6ad185efb3b2b6 SHA-256: 1b966e4491ff1adbea19eea18c0b7b671044f55357bb1e404a6a38f6878691cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs and the document's structure suggest an attempt to trick users into visiting these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pctus9qbavc8c61s7h5h14mepa/7645516010.pdf
    • http://hoanggiaphatland.com/uploads/image/files/99229365970.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6d10a197fe67649f913f78932f412e6f/53534888239.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6da01b757e540dc77b4ec37535fbd7f4/30483483722.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7604b9b9a---kokadupipubejuxomurog.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9fbcca903f415215e9eebe6afafde766/72358997417.pdf
    • https://yar-net.ru/userfiles/file/telosuwubojuzibir.pdf
    • http://carszana.com/image/upload/File/40550918007.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda79d5bab---70423048421.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/08b01f71eb581b2090223987c861f17a/21435987904.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ebf54da41d84b6be67f0789e9ca94afa/bipepefa.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4be16843---41549252275.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/wufogigijelesigesunaz.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe0ade62c---zutuwobenigeradotisu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=diseconomies+of+scale+meaning
    • 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_off0000debd.bin
9581ef66cbe7cd165c6652b47a3f9bcd47dfb3850456c14b8d7204651d4f096f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 18032 bytes
font_01_sfnt_off0000fb5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 16792 bytes
font_02_sfnt_off00011371.bin
4e10e29af5f034cc5f941246d14ac7156f6b02755601820b57ca922aeff8b4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 16812 bytes
font_03_sfnt_off00013f2d.bin
e8969ae7fd0ce21279ca7beb54f3169eead0ca92233390d111a38695fcfa78e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 10484 bytes

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