Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bb69ecd9403fe3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 71a45aa10e555cf9df69a3e70c87267c SHA-1: 75bb1394f1ca99a8e4f89f8be0ea568901e006b3 SHA-256: a2bb69ecd9403fe36ef0e51e9fe787c212dd6ac29995b86a72853085d285c65f
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 0.9912

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://huntic.ru/uplcv?utm_term=administra%C3%A7%C3%A3o+estrat%C3%A9gica+pdf PDF link annotation
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/julibina.pdfIn PDF document text
    • http://artside.org/data/temp/file/50979095525.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/86252606665.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/85600575350.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/74564462379.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/23fc0fa6dc1be75fa47385426411962c/69182250359.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/17141069264.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kajijalevuviku.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f0a143daaed3617ea4654b03e6654ea8/dilegakimakadapibudu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/20212183943.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62c76f2c6---35282709693.pdfIn PDF document text
    • http://firegallery.ru/img/upload/92865536612.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d9490c04---75595613238.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/lanixilafifedagi.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/88468433447.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/wozaj.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/47208017284.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/78399978833.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cjansbsecoi1tg87ntdlv2rbv9/nimejezifeworisa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23840cadc6---wibow.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/zasazenuna.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0ac788fca745312fd289ff6e36be9a23/91627097835.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607901ef15b8d---86555129426.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae68a77247---gavopot.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/21631345159.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/80f37c60735375d1c7641858a3b121c0/kelebenexedefefa.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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 20248 bytes
SHA-256: 7ecf06a5defde8c03728ac3b8e9878c6b9f64199d62c3684708db1c3f0d4613e
font_01_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 11516 bytes
SHA-256: 42baecbf20e9df79c475172eaec9a33e8d551a4fcd99a5e6fc395c2dccf770e8
font_02_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1