Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd275f8fcd52a3…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ad628dc1a02e36198ac95ad6fec6811 SHA-1: 02432dc70ca07919aeb7ec927aaa9911714fea40 SHA-256: 8ffd275f8fcd52a352cd7c029b855ee3bd496727b050b876896e7fbfbe3a0dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document's primary purpose is to act as a link farm, likely to distribute phishing content or malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://catamma.ru/uplcv?utm_term=order+of+war+trainer PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4c4939d4---vunemudun.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/82271415249.pdfIn PDF document text
    • http://kotolantopeni.cz/file/58398134349.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/limokuzubejepivu.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/tukokokulumeb.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/deteletetekotefibeguf.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/67597751754.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gupuba.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/40635821060.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/fonisufibulupilobevi.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/61356032076.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16150d6895db45---66107646755.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/aecd552e6111001cc02b354928f939de/tizumuvidiz.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/3106327536.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/55501228327.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/kagivi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kipegeruxed.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bivel.pdfIn PDF document text
    • http://zaiger.ru/img/file/64278382210.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/v5suc3pcbnadkulu8jlu3cm74l/68359313999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a21514fce---55738698509.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/22861263666.pdfIn PDF document text
    • 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_off0000adb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB0 10244 bytes
SHA-256: 3e51d950b92fe9eb3f5348426ac92102403891c439c608d1f254939448e9423c
font_01_sfnt_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 14596 bytes
SHA-256: ebe9fad573e534a016f120e01136c4c7b3c45788d938bc644cfef8038189a5d5