Malicious PDF — malware analysis report

Static analysis result for SHA-256 284bcc2e261be957…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 09:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bc5a6a5e9065d87529c6d3e8e921dfe SHA-1: e2ffbcfbfbf43991214fbd489730a66915b462d1 SHA-256: 284bcc2e261be95767e9d206036912747bd446d0544c7d596b67d6f2d4a0a522
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9117

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135992909266---xerafuju.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dafa6ea15---2432932407.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/43998266615.pdfIn PDF document text
    • http://belniig.by/public/file/salosizemupezusufaleti.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d721675e1---1190247966.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/79413107612.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/javopusimanize.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/vibiwarabo.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210904075601564.pdfIn PDF document text
    • http://halaljones.com/uploads/files/19480140007.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b31c66ccfbd9f8fb5fdf6af281f29919/veleted.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/80220201912.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/64260368577.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/440cc670e607229321f9903630dfe9e7/43527912949.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/samedu.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dudibazidozudeselimag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130520c4882b---63415759803.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c66eeabe9---27083368441.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/56669496487.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/97085414726.pdfIn PDF document text
    • http://methese.com/upload/files/80303846295.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe073628e---14194739732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=let+him+go+filmPDF link annotation
    • 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10084 bytes
SHA-256: 05b5a145bf407046a698629be8214f2a7ffa7cdccc567fbbac7ac564852ad41f
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 18180 bytes
SHA-256: 39f827b42245bd845846c62c508bcf6017d51132a334a21b5bfab6a595388c79