Malicious PDF — malware analysis report

Static analysis result for SHA-256 086bf3888f555d71…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 19:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 004f6cd6f72f22180031f62eb9c83b56 SHA-1: 8dbb2bd4a9db1785258534f058ef78e8c7631f84 SHA-256: 086bf3888f555d711fbda67cfd913c361a67f665e0f8dc0739997f22b3492935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs and the heuristic firings indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://szabolcsipeter.com/userfiles/file/dojotevowapof.pdf In PDF document text
    • https://dveropolis.ru/upload_picture/kozapuwabufofos.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210924_0F2D3E75DFAC99DB.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxafigenutisa.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/komiluluro.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/16504306543.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/31110671551.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4d65d1419146aa38636355ca6c1ec741/lepak.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c607a953e---65761886192.pdfIn PDF document text
    • https://verner.lt/images/files/61026723492.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2501cc4d7294f6d786d92f75e39a79b6/nibiwelomogorijoduka.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/jewokizamuxaxujipafew.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pemugativezusezit.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/585949e45b2bc8c79a0f0bd0e94c8a33/75011560897.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/41460983794.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/muzutelizugipomogib.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/84175393151.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/99902ea27ea4aaa5d1a050cd4857c77c/20145118883.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12719723794.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/xefufoxiwisegijodexovafi.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/846425314.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4fbe48d087fed0983ea1429f74bb3c9c/welifukezapaxawureti.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19517346763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hack+instagram+passwordPDF 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_off0000aee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 15400 bytes
SHA-256: e19f83f712f612677f32fc613211372c7aa543e57ade4a66c6f8ef4afaa6a1a4
font_02_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10848 bytes
SHA-256: 8731b39aa01374991027eb9b95c244c4fcd3310ae6698f39d7f32c2f6345ade4

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