Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64264028b12e369…

MALICIOUS

PDF

90.9 KB Created: 2021-07-18 05:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c15c702e0eae235a89796e1ff931e5c7 SHA-1: 462d73d7c6c023d5e98d9c35e91111dfedbf1ae2 SHA-256: d64264028b12e3693fc47222fb99372ca082e163f6315b922eec7d20feefa2f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt by luring users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0edce3a56---31745448635.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/eba90bf09de52c1d57c112f45f796941/tegup.pdfIn PDF document text
    • https://tcremich.lu/files/files/86208580426.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/34840965266.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/mubidazapupenopav.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7706768b---zobovesiwis.pdfIn PDF document text
    • http://zuche0551.com/upload/file/87693314134.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5c422b5d---83205520391.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/20294244990.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jogopazis.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add1c3bf04d---lopumalajalulexewufuvu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c4367f201a525254e8177f558da14955/79556711101.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff70489d6---93829282364.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3d24c2fa4afe7146b1a2529f469675c3/wopiwa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca85dd6a6f---42332934649.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/43584163273.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8799647da2f39b2fc976fefd62a14972/tunebuludegelokilitosuko.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/abf7f0f74bb8df50bcd16e02dcde4a35/49993234297.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dd020e8e819e7cf1f97ecf2d5f055ce2/25392817084.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/46587129222.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/piboleduwi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2f502a87---74409782756.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/64105219653.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/febeseminom.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/wiwiwibasipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ps2+games+apk+download+for+androidPDF 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_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 11040 bytes
SHA-256: e3585956012d5580a1fde18fcc45438aeceea7ede77b15e2cb960127942b2f35
font_01_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 17956 bytes
SHA-256: 7d762f8a42c184831778b98da97805cd59ea1bd8dc57901c4d7e5fcadf1b38f8