Malicious PDF — malware analysis report

Static analysis result for SHA-256 9420ffb8c10fa7ed…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 03:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7379f1d2f641de3d5936d8840f09458a SHA-1: 8bc6bc9c01c0993b57e4f6c59cb2b77b7fa4b270 SHA-256: 9420ffb8c10fa7ed9ee99795fadfd98dc7cffb86d4830593346d7a1d077ea1cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious or SEO-abused content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k5rv7eu40qida4qrkosb3nkvbk/92859943191.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/063cd87883faf41b25e90a379c34980d/vunuxatolugazeweni.pdf
    • https://chiuman-hk.com/images/file/14730028771.pdf
    • http://netinflux.net/userfiles/file/21024044783.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/381d22020740d02d55ef150d118486f4/40622450284.pdf
    • http://eaas-journal.org/survey/userfiles/files/19254584888.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cfaacacf72f921115b8a59cc9e3f2836/xamomokim.pdf
    • http://omonetach.pl/foto/ilustracje/file/ropafepejofoba.pdf
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/xetitawekoxezusigenekaz.pdf
    • http://pusancard.com/userData/board/file/57367981652.pdf
    • http://www.heksan.com.pl/file/58322842413.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607774bbaa786---45227869565.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e093f33168---36155845545.pdf
    • https://chris-arnold.com/userfiles/file/kirizusiselitodokatana.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/661cf205ec9eca8e180f9d5d15c32c13/23009117379.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/zeduzux.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/nululex.pdf
    • http://radio6deenero.com/uploaded/files/62730137246.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinofivuwogegimadukilo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81fda43e7---41589042226.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab44ce046---30952237058.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609475f34d4fe---wulizegamivisomoxudibe.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/367a88674fdb22624d6568a8410b8c20/27607479111.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2619017bf73709fa9654e05c97f3c6c9/xivikedokekovan.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706f9f6bf01---kikamobexagu.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5ij31sddh17qs4gfon31u51nns/xezitomupavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lyrics+of+lord+i+offer+my+life+to+you+by+hillsong
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d022.bin
bce93255f5b23f6d48821929030a72cca149159db34507b8be977b4dda4ec1cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16780 bytes
font_01_sfnt_off0000fb85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16792 bytes
font_02_sfnt_off0001139c.bin
2cf388a969df78242dc0f8ab112d5e2f780f8fbf9b99a04eaecdef926c65239a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 11072 bytes