Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27681ee82f4d4c6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 21:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a192b916f28d7b9d6c659a56449f8b43 SHA-1: cfa89f0026ba7735afee24fc320f80a9ef6004ab SHA-256: d27681ee82f4d4c6f6c568de1f08f3838de17d3ea1ab8e9d28652e4f2f48835c
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 0.9948

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 http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/71956519784.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/selikoxofug.pdfIn PDF document text
    • https://2acontractor.it/images/file/resojewoku.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/fifunumitadodagelepomare.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/moditovotajexovazug.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd068df93---navalejuzosenodarazenilus.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/73dbd134a5872e12930d020678f5d2ae/16679329332.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/givebofuxeretubezem.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2d7d3f845c60db3408a1a70e7e39348b/9593623624.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/zepujonokojasokelezonob.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ccc44cbf636305265df8ed7282d75022/nalutujediw.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/747268f74c078f9e6fe9e25b8e548c70/febemupiw.pdfIn PDF document text
    • http://poorclarescork.ie/images/rarilurabuwaji.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89597235829.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/danuladinalifasevijavej.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/23225089938.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/baf6a0552b8d77f74733233bdb3af630/19113793098.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bajog.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/selamixatovik.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/kexasi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8715389f3e6b06c245ec3845be9f74cf/62939340849.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lisedu.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/zakobixerawizigiwepexu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8a1c734b---7769355400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=craftsman+24+inch+snowblower+electric+start+manualPDF 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_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 11156 bytes
SHA-256: f5d889e57db086377f7317a3db677203f41d682f4e2fdcd0bb902c1b54349841
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 17688 bytes
SHA-256: 69158ba23b5d074bbc5ee3c0ac3c1339ebb96be3c68876ce8e22526884f18436
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1