Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ffbc9c8faba17e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dde51b5da5078d9b594750ddb9585996 SHA-1: b109b41361f62ced94b0d3476d6bd14c9ade83db SHA-256: e8ffbc9c8faba17ee07c422fce1350eb117bf7f4096336a5ecd9a0a4ee709a02
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://op-gold.com/ck_image/files/fetajipige.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69b5a75d0---fowopoxunemibifef.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/26381140515.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00154437d---taxofaxawujoseniwuzokurij.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/75129734900.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/14d845ce3439c9252da99a1d53715c60/doguvudew.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7818q0ccc3cgi4oj7re0buon00/naxubutewawatudopubon.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/kewaviduvanubelelugigo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a2364bde---rojeraweditada.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/8fa07120c3baa3d2e5859f0e96858ed3/73211872567.pdfIn PDF document text
    • http://didula.com/img/file/rexip.pdfIn PDF document text
    • http://18554080.com/userfiles/file/kiwul.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/57si9oqnlek3nk49ggf81cqqqv/lanazigokelumavusifubonu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/87b066d934fe4088023d47bfa6f25386/terunuzudifoguto.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/jegevomapomoxumareboza.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/potun.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/lonusu.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/80626402891.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/bikerasobawefomokegugizeg.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d03cd01878c---loxomowinumijidixuza.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/joxatejubog.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/98418116149.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/3048442565.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/bopimote.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040128e7e0---vevegozuzixumopikoruvate.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ec2e3bb8e2cda7251068a8e7ca60f2d4/13482348748.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/20018359942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=words+confused+and+misused+worksheetsPDF 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_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 17920 bytes
SHA-256: 4c99054630928d146b5ea1bec3bf965c658292e194532ff11220064f87b2d429
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 10964 bytes
SHA-256: def0bf5766cf6ebe32363b9176fc15f41ab26c33183241358694523b853ad7a1