Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c812e0d6136cb5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 18:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1e5f868c677fd00c266b674503884d4 SHA-1: 2c081bbe87748585e2a821b107b45d56afedcebf SHA-256: 92c812e0d6136cb5a81713922d5b25800269072ed50d4844856ca8dfbbd890ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the T1566.001 (Spearphishing Attachment) and T1059.007 (JavaScript) techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=best+hd+wallpapers+for+android+phones PDF link annotation
    • http://geosond.pl/userfiles/file/17867647989.pdfIn PDF document text
    • http://riph.pl/userfiles/file/61918015438.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24922135307.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/98055260343.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/90801292550.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/wukurijiboxulixinos.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/82170574994.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d23534ef5---31474961525.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/61908167643.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338f573fccb---zofoberuwadolofivagebabe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/11406343026.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/10663138528.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/78952201163.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/42068717815.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/30723729644.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nanezomodimewake.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kanupegulom.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bd7f1f25---rejisudanabupokibe.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/29195522080.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/setilozumopata.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/21921049550.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/54842412395.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34221599342.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fuwusevufonumekuvumag.pdfIn PDF document text
    • 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_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 17620 bytes
SHA-256: e03ec6c12b9d7fea8149e3fca984c602a73d7f60c3f4f9772c8ed246714560a4
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10732 bytes
SHA-256: e2249f4325b042407c695fe5bc10b85f1a552857bfca5fbc5847b0fe5e17183f

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