Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3585db3a85b744…

MALICIOUS

PDF

73.4 KB Created: 2021-07-07 12:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59f382ca2ac9bb7d345756c20d71a462 SHA-1: b0f1d24fcc108c504eb022204ba5f49bdd61b7e8 SHA-256: 6d3585db3a85b744c095e05e9261deae5f426570475a8590da5d6e80398bf559
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it is a link farm on disposable hosting and a fake invoice lure, suggesting it aims to trick users into clicking malicious links. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984256adb92---13612103204.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c24c2dd36---11348590047.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t30kahpvetmdh96sl58omc0qcn/24019078533.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/33603153625.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72df67052---30968815136.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b976418689---90237582647.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a2290892f02---5523821987.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c43c3786---53597584.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mulugebovakog.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/54573681475.pdfIn PDF document text
    • https://yellowstonewildlife.com/razudozulinofidokimefub.pdfIn PDF document text
    • http://pneusmarene.it/images/file/76759312000.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/86619328494.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd3a7508ea---fegawututasedalumaxarat.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jopulalizirajipusib.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/95868792382.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ca12spchns1564mb9aqes31bp7/18985439418.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7ae89654---22252944298.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/jugijuvejebubotur.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/7h90b6r9odkpvmvg5v8p8c75sr/xifofetulixoja.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/pawidoxojoboruziwa.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210701_38DCC0D9E866E656.pdfIn PDF document text
    • http://df-foundry.net/d/files/1172786742.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6dd0ba9c6---gozolarugazikopigesofun.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d9b6910d1178e58b10a54da6ec551a2b/mekizubit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=purchase+of+goods+and+servicesPDF 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_off0000bb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 10776 bytes
SHA-256: 379a34d4936a3b4be1f2867fce42f28182a0efdc8eec012d977c58dff7501f3a
font_02_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16496 bytes
SHA-256: f078b72a1f17b8720ed40a786409fdf0a041d8e8eabaea17372b516a82daf73d

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