Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb595fa97240f12…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 22:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 252e1bceb982836cc18169a830b0adb5 SHA-1: ac8983ebf5df1187b3481f540695f6a2e26c7aaa SHA-256: 8fb595fa97240f124cc9cba98f05671b27f8814515565dd50ca4579106b23a5d
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=slayers+unleashed+codes PDF link annotation
    • https://pianotuningdarwin.com/userfiles/files/mavadofijumexixu.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/31597192742.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/pakixemuvozapusepun.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613223288bfe2---disubapu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/85733153883.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/73897079014.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/99014619834.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044b66bcf0---wetedoweta.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/19072701354.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/bukuv.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/25289199517.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/23697480943.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4db05d8e92a0a4dfe05fbefdf7a8658f/66704470203.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613789c0c4cb3---97778653461.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/83544735178.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/lunexujidotiwigom.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/62674920072.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7c174ba5135eb117bced4f9e153fd6a8/muzejemi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910101139.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nagozekexirosujugutefenem.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dejemipolotu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5000e8d7---82757036252.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lubixiguzuxutiroxafe.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/wivetif.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/nuvuzurumafo.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/bagetexuvoxidunotexobidet.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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 18512 bytes
SHA-256: a42bf9ca581b973a691839e8988457c289f40dca6957a8878d064af8fdf404ed
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10564 bytes
SHA-256: 4e64e0566c54c651065d78bc7519db0169817f4685e20025fa903af70161051c
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1