Malicious PDF — malware analysis report

Static analysis result for SHA-256 763cee668a310150…

MALICIOUS

PDF

111.8 KB Created: 2021-08-05 14:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a8cee54f4c8e855de24a9e480ae4398 SHA-1: 628e0d61fcd9b0da634690a64de7c93bfad8a572 SHA-256: 763cee668a310150bb522adab443a3404b7dde87435744ac5140e594aac8dde2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://interior-mark.com/ckfinder/userfiles/files/punejiluregikulaje.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bdf1359c57c142218042175023d359e9/nudagowabuvifunigok.pdfIn PDF document text
    • https://cncunse.com/d/files/wepexigijogazu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322fd60a3e---97910096686.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/ruzoveroparejozokol.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5035befc51---zisamutikejopomegav.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/magaletixeto.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/78785326995.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/21904576788.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/kojowapazes.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/nebavebov.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/dl7tri4e7tcrn72bll4m4hr53c/japupoxibusaki.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072acb0c7ce9---vezixonajiwirebosigob.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/modifexifulidurekunusi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fofarawiwukexax.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/fekevapiboselivupobiwatox.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099924e32099---4582843268.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/96446414724.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/8167083811.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/de379155f846304924673d5b765999ae/52252727728.pdfIn PDF document text
    • http://www.pvvc.cz/files/gezimejov.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/1038470161.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2924a885b04d1c668903c57e64f55fe1/fojoweralun.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/24901814337.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/21652273699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+learn+oll+faster+without+forgettingPDF 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_off00015294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15294 10668 bytes
SHA-256: 94b3b38a874765fa02978334d4ebebc7bf57d157507d71b0e95b8577150f0d0f
font_01_sfnt_off00016afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFA 17348 bytes
SHA-256: 6bbcd59fe4af2e53d492cc49dab6ebbf6cbcf4aa8c5e95e55d23f7efe6c55984
font_02_sfnt_off00019806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1