Malicious PDF — malware analysis report

Static analysis result for SHA-256 3299ed5797ec4169…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 05:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7677d909e165897f0a6e5830b7fcb69b SHA-1: 75257bbecd7f178eb0626c3f78452c9ae0b90ae6 SHA-256: 3299ed5797ec416911a33c3c355fb97625c1e026efd124ec71eee48b65eb4931
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dezmaster.com/userfiles/file/63325127847.pdf In PDF document text
    • http://attlas.center/userfiles/file/99014987380.pdfIn PDF document text
    • https://marosme.ro/hirek/file/sikivakaxabukerik.pdfIn PDF document text
    • http://cloverdiamond.com/file/10551301387.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r0jo9r6ki0hq2qt4bri9hm89nr/11845175766.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25d6bc6c84---fitudunamagofoxe.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/41423193367.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/duxujilimugawiwokosifal.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9fdfnnncnpp6hp06sq2p689uh/30875384799.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/38269594784.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/112977ac8d3e685b1a0960cf2f440448/85009311836.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/41251476019.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210715_9E587BDE18B85E6C.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210723_020842.pdfIn PDF document text
    • http://fruitvita.com/files/files/liledugajimoturomogur.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/jetob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf66e6c8c---12630785916.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/guvipuvodezax.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a4262a91---18776470475.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/93925313527.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/nimolamupefizem.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/16024172022.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/48745648494.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hp+elitebook+revolve+810+g1+service+manualPDF 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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 11488 bytes
SHA-256: cd90ae9a9fa49ead15d6ba32249b24a7d563341ab7e17d79cfeb9b557addf1b2
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 15848 bytes
SHA-256: 554b0a464e5c737dd40e5d340f7a2b3254780f5f6fd0b302aa74c955fbbbf67d