Malicious PDF — malware analysis report

Static analysis result for SHA-256 353198672542c7fa…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 15:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 66a7e011ff95c5d253db32990c707421 SHA-1: 3c5ea845a71127fb71bae53292b7159b3d029be7 SHA-256: 353198672542c7fa0304af6ac4c8db63c422f10dc0b780c465c80b4bfd05cc2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://drafthe.ru/uplcv?utm_term=pujol+seguidilla+pdf PDF link annotation
    • https://sportsht.com/userfiles/file/lixobupusevivolarafofen.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/gomewawikutiwukiwuzuzolo.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xazatijot.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/fevawenazanarimevuxesofe.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hj9jpo6452fgfeefvjd312n858/703399579.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/90610695955.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/podinored.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/91183641005.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/gawajetegotubodumura.pdfIn macro / runtime command snippet
    • https://almuhja.ps/ckfinder/userfiles/files/vawatule.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06db58008b---makarisafitulu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/53595272899.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/54109431805.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/44900518179.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/fufugag.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896480c76fd---sajufidisuredemoxeb.pdfIn PDF document text
    • http://cwesp.biz/upload/file/30978916585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130724ad73b1---97152722774.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/bomuw.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/72977388158.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210819150007151.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/89413046811.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625ea046ec---mowimuwujeba.pdfIn PDF document text
    • http://skipjackpoke.com/cIn macro / runtime command snippet
    • 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16912 bytes
SHA-256: 08d1788cb2a88c71225fecf4fa4486e6415eedaf0f9e59b6ea49498ffa6118bd
font_01_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10600 bytes
SHA-256: 27ef2c395b15634ad5c119c7e3c84adce10e36ec91b4839972de52974f161ca4

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