Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f76ce322dcc95e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 00:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5cc8f25947b1f811cc8f6d750d99f45c SHA-1: 246f0f6e3f844edecd89a326e9a466c56c8323b8 SHA-256: b3f76ce322dcc95e828644a473a65bcb15d25e5593e54ef905c2b74e0d93c169
156 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. 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 0.9992

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 https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6318cfc0f123166462865bbbee35d20a/52627763369.pdf In PDF document text
    • https://pinyardim.com/calisma2/files/uploads/balakezudidadovi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/wopifob.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/83531892755.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081683573e98---xofuzoxebon.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/1309200089.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6sb70afsr4bage911jk95b1igd/62596049831.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/59552597899.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/majunemusugajepidizi.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pafubusorejubivomipa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f45aef8e81a---widibulijedaxolujipom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121970ad9eea---78054528244.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/76070469654.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqqacfigecmbdq8mlkdtel3g24/goxadexo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/813354cf35c551ce257ded17c4bc2c3a/lepovutodukivofipajitix.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/132c861f27c2c684c1aace6e67e8fec0/lutepedelokozid.pdfIn PDF document text
    • http://forti.in/userfiles/file/77885987031.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/satatebudizelu.pdfIn PDF document text
    • http://ozari-ua.com/files/file/44376627894.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0de080dec---50358612890.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/29603722141.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/01qo0jev0lh250gb1g28fvk051/netuvujuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chapter+12+dna+and+rna+vocabulary+review+answer+keyPDF 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_off0000be95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE95 11412 bytes
SHA-256: 711522c555cf7c74686fc696ff2e00749c719fb4a2b62675a866cee418fa411c
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16424 bytes
SHA-256: 63c836cb2f7677e3ec502e4684315265e7a387fc1eed77295e11796d22348be7
font_02_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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