Malicious PDF — malware analysis report

Static analysis result for SHA-256 726ba77c9856468b…

MALICIOUS

PDF

92.7 KB Created: 2021-07-19 00:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da601b1d6877fe273feec26975bf8386 SHA-1: 40a27ae44faf616a5dd5329ec87c11df008e4881 SHA-256: 726ba77c9856468b62fe45398d24d82b7a582ce6ba6537d0ac6aa5b5e4ebfba1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8492ded61---82009459647.pdf In PDF document text
    • http://softtox.com/new/userfiles/file/bamuxakatozufogogem.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/xelubeloxupijemaw.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/95ae9e8644519924ec168ac3946a8d52/wiruxofodepa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tuvizomafemez.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/sipagetekanemimigiv.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vekefobesowovop.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/11692965206.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8519cb671b89db519d97634c2429a464/bebujowirevanekaw.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d3bce94c---fikisemujovusulevorowir.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/jewavijenobesenoja.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/valuzejo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/54848337456.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/91842522334.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/515576482430536e076c74cd6353d34f/leporevamufepegemideg.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a243678a1fd---52392792527.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf3c383d6---33657093964.pdfIn PDF document text
    • http://gtshotel.it/images/file/73464826733.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0f1e71c6---34104998636.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8df66465---95850272751.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jeraxetozupewiti.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30eef7a541---pujenawazozuraxudimeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+draw+a+pentagon+inside+a+circlePDF 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_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10764 bytes
SHA-256: 2e51e3fa514a2af9ddd43524e73e2536b23fc33ef1fa70939af479a616f08392
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 17920 bytes
SHA-256: 8c3c93aae6d4257b7bc37b30ba4287055996b98e0f87f1780ce03e5fedbc8e56
font_02_sfnt_off00014d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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