Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaade472d4d505f…

MALICIOUS

PDF

96.2 KB Created: 2021-07-25 04:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9b8a305400c0875924a14621303dcbb1 SHA-1: 5ab35ca5a32b3600937267a39b4e048d9b34c819 SHA-256: adaade472d4d505fa4b8f703aadedef8adfe0dd9722cca6d465243567d1c757b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains heuristics indicating it is a link farm and a lure for browser extension installation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs, many hosted on compromised WordPress sites, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuhomania.ru/ckfinder/userfiles/files/62316895168.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713ef7bc70c---59653273393.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/40ecc13d740b6b99b5e3dc4b25bf6b0c/39995481783.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/lavusufaziraxewakavupeni.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609734a947522---64362814079.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357194c2a2---monesedetesazejefov.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/melifan.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d2b2225b---47548285926.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kefogufidikemuvopa.pdfIn PDF document text
    • http://fpole.ru/sadm_files/lisowifafuvuziv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m85lbb441ru0d08bntm90165gq/50379000338.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/94127618669.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/41998000258.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc98e2163e---xupadobixud.pdfIn PDF document text
    • http://asfalon.com/__files/file/39470776154.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b2ece59b---77233595188.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2de9df433077b267a132eb79032d5459/bokofujeginawevasosinorek.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/77428731636.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/55089419940.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q3edfrrhmac7hl0d5kfuel1u17/14022470289.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b54576b04---pulefefufivekisidupesix.pdfIn PDF document text
    • http://4bx.pl/public/file/33734640264.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8ec3c7fc8ea05b6b65e75645cc3717a6/15366141096.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e921aec269d61dd3c269e591f057ef98/95140739575.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92161368676.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66437221a1---7526971359.pdfIn PDF document text
    • http://dakmet.pl/upload/kufodagonepikilot.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8hlh8c1jescus1tmmdh11h25g7/koguwufotoxafad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+fix+my+samsung+washer+se+errorPDF 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_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 17792 bytes
SHA-256: 7cf936ebc92fbb82e3b0a377ded9c9382ff02995281313e01efdcc0de46be2b8
font_02_sfnt_off0001591f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591F 11048 bytes
SHA-256: 7d28053dfca6e60c16cfc5fc0b97e2f0cd4884cd4e1aab6210d0a641146bbf07

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