Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2098a1117f4971e…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 19:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90549ce49951ad9fcc2abfabb0af529b SHA-1: 05eb57972f5fdf63ac8609c4596fe09107756560 SHA-256: e2098a1117f4971e0a22627aaf9ab7ce2f968209a281fd14b6c0095bedc40295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=picture+hider+android PDF link annotation
    • http://kenhuffbuilders.com/userfiles/file/mususujilafom.pdfIn PDF document text
    • https://ayurmitra.com/files/file/55610656748.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45752496271.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/40217633829.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149a7b4d8290---tukoxagavikelufesazum.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326189c5d8d---fugumajidoji.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/bexak.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/89383803179.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/18335126894.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210927173826_2vr244.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/81595516170.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/35356822055.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/69884313049.pdfIn PDF document text
    • http://rjt1.org/upload/files/90163821507.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/26003379044.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137164f72b79---tudanijiro.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25db23fb3---solafiliwofufilapejan.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/pisorewamudufopunip.pdfIn PDF document text
    • http://tatooazh.ru/files/files/52382769340.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/zagalatazozagulasinezav.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/76778355455.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/98720370437.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613426f0f3b24---9398118472.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614289823b745---71373362286.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nubamutoda.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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 10356 bytes
SHA-256: 6a3795d2302af010801ee7f0e38286acdb8f16f75830c818f5ae9fafcef3565b
font_02_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 15248 bytes
SHA-256: 4d1aeb2697062c9465667a08c43fbb7927289b33aa90aebf525f2cba27a22dee

Open this report in the interactive analyzer, or submit your own file for analysis.