Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58a5729183550c4…

MALICIOUS

PDF

88.3 KB Created: 2021-08-03 06:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4e3cb8e285b22333170d827f86581d3b SHA-1: df38ad0be4b1d63e815bed343042a6a2d7c2f38a SHA-256: a58a5729183550c4f8c4f165fe37934bda48c0fec59c8fdbea64ae6e9ae02ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=download+windows+10+32+bit+iso+google+drive PDF link annotation
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/9029591340.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/30272497212.pdfIn PDF document text
    • https://masihpt2.com/contents//files/98912087074.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/33448730669.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/69554704833.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/efd92bbcbad97632417365ce53b39462/93549981256.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/73360012909.pdfIn PDF document text
    • https://coevent.ru/upload/files/80098579491.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/58156286062.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bazupizofamiva.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///92009110925.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e055b1ff0---sudusopuvisuguvipagusep.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4a3cc521---84495872329.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f836c85583b59f86a3f4f2a503212bfd/redaf.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/limedifafinuxobomiw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeba8af2e6---7395544787.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/848ba2e2a8f3c1cf037538803b55e303/19593264488.pdfIn PDF document text
    • http://kotolantopeni.cz/file/11334227997.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160774df9c9a71---gurotufisaxokogurarafekab.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f3c9f42---25480585107.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d997200---zojumis.pdfIn 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://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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16860 bytes
SHA-256: 6e8968083c6035bb78f098be96d07b830df42d781a0b674239c76b77b58bdd2a
font_01_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 11180 bytes
SHA-256: 4e104618ed1ab602a94cfa0e376df4448dec4048a01a74f83506185c1be66fdf

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