Malicious PDF — malware analysis report

Static analysis result for SHA-256 373efbe41ada1cf2…

MALICIOUS

PDF

96.1 KB Created: 2021-07-15 22:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4447f69c929c216f2c771838c02c1480 SHA-1: 0cca2af1dd0090eca5baec874fe63b9145ad13f8 SHA-256: 373efbe41ada1cf279db435ae56062c3eebeeda6116db27ebf921d4efb3167a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9853

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://synerhu.ru/uplcv?utm_term=minced+meat+cutlet PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/abe536a80a57de3c414f10c375433e8b/nigumakodatoji.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a60rt3knsns9shjmn1nt84q4i/menudokobiriw.pdfIn PDF document text
    • http://olympusflights.com/files/files/81022085005.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/59580557814.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ea6bdc79---11235586307.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed1861a25---somaxezufodaner.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac436230e7daf4e2a1510c3ba62de87e/loluniwikufovimapidupa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9geji7s4qkqglk3i13rmituro5/65858765653.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc71c6a8bd---mumepa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/305637babe6bf6b75fa916c9ea0f8dd0/67017844468.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/os17mn4trq5r367ou49satdgge/lifijajaxenotodo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/58130144824.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb9fedecf---boledunopuzesis.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ea7a13af---55709820566.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0aocnhqqmf26c484ri75s98chm/saraweguga.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/12914658468.pdfIn PDF document text
    • https://blokhol.com/upload/files/sedefepowesiwiforera.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7067622cb---60041862817.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12139656642.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/de3e2b1890d7aa24b490cd6aaf6fe27a/13217384926.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/manakadajigirur.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/totusenemuxufizazomodafi.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49452322291.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16744 bytes
SHA-256: eb727d576d3de5659e2ba848dd758b8fcad0c54a5a824f7d78768f1aca98840a
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 19456 bytes
SHA-256: 33315087b94250a6a8792f3b535320252e47227cbe5fd615d545f401b03a8307
font_02_sfnt_off0001339b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 10236 bytes
SHA-256: 5286c0aae38a7ad22deb532fa69ee80543e27a61db8a250fa535d40a846772c1
font_03_sfnt_off00014a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 3616 bytes
SHA-256: 19e4d760e2bf177592314c46d75007dc0c372cb6148b34d9d50236a783a56cc8

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