Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1776f7e3cac8264…

MALICIOUS

PDF

92.3 KB Created: 2021-07-05 12:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac767f3f02a3b689a2e4cd7ab0bf2365 SHA-1: 571bea31a1228cd8d92f0252d22cbc99ba314035 SHA-256: c1776f7e3cac82641688ffef6e6f9d658ee663453fddcb95a15456d8bce25ea1
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 0.9937

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://pixomot.ru/uplcv?utm_term=an+introduction+to+the+theory+of+numbers+6th+edition PDF link annotation
    • http://jedwines.com/cmsCart//upload/file/18437676945.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/mokipelaxid.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/vodaxizafubasugikikunez.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/82298227552.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59566424449.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa11088f3c---19587325953.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f99373cbea1b201b8853814ce86b10c5/lojimim.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/62418968922.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a50954b5775---kupuwipuretaf.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rv55ojnca0d80bc0fjjq2sqkgt/deluboxikedorosifanedera.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c67308cc53a---60312537880.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7096e93cafb77367b2298ef2e85580d3/60316188049.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/sararutovapamumubuvaza.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c34fcb670---noparovapusovuke.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/7227801564.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bac326d7ebc---60185138453.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805a0375f09---karalujeg.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bc577f0e31f7a8df6199077d90a77c3e/wuratifapopetisexofe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3b2e69ef---72806740992.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4a45f01182b2bda18cebb28e5de2c6dd/losinuv.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/31626726558.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/83955863943.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f33fd0a422b16f9adc8b8a74ce65c416/73608430207.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8a21e7cd---bijuzuvepenujupesiluxufax.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_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 11036 bytes
SHA-256: deffde50880c073e6807c8b0f35b4b62810d190350fcb2d15d22fd97f595829a
font_01_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 18748 bytes
SHA-256: 538012fc72997e762579dbb6d7fffaf9d82a688211d0d45a46fed237f47d63c4
font_02_sfnt_off00014c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1