Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9077bbb3e7c4f5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 12:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4cf59fbfdb1bf0a762374dbcd8dc912 SHA-1: ff3825970a5de7778ad3839caab0ea9340b539b0 SHA-256: 6b9077bbb3e7c4f572b6a630de027203950f05b8f3f183dceebca3e41edf799d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on disposable or potentially compromised domains. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://0800-707-808.com/upload/ckfinder_temp/files/20210901061003.pdf In PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/gatanotisigafadobeliz.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/72558308958.pdfIn PDF document text
    • http://abwessex.com/uploads/files/66236245012.pdfIn PDF document text
    • http://budropol.de/Upload/file/85304798398.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130490a55e9d---50596062513.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/bukibewematilinekem.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/77497034069.pdfIn PDF document text
    • http://caythuocnam.org/images/files/25848934850.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lavamojavosepovu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/66073871841.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210905003207.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/44634415450.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/67801093264.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4ce00ff4820f655da4a714031a497479/molevomonanagar.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210908152531.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/zijelilifabuwufugejusu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613052dd41a1f---25264543300.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/21041408032.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f14e79276---36770627899.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/70382799429.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/xomixekujifilupam.pdfIn PDF document text
    • https://petek.biz/resimler/files/86678843250.pdfIn PDF document text
    • https://e-midas.ro/files/file/bokesukiki.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312e33c5c35---60995034280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=73%2F74th+amendment+pdfPDF 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_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10472 bytes
SHA-256: 3d34be8352ef8b550adfad055b15ce8f540ed12684afbd2faf2358106e32318e
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16628 bytes
SHA-256: f376ae54500e3d4df4a25c840917027b9cfb24fce1c0d0ba874b3a428e20859e