Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c31b8d5a4a1e436…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 03:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a38f774af702089a98811c12a1fc2d48 SHA-1: 11a14295552346d9143edadbe7ba128b938554cb SHA-256: 4c31b8d5a4a1e436750f571ff50627932b4a888a90dbd2f5a3f817ba89960e1b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=android+open+qr+code PDF link annotation
    • http://architects-desk.com/uploadsfile/92713518572.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/14857444144.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161427f840d5b3---wepejagilepowadigosizid.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/36072264778.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23414174443.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/13228413569.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/34246519937.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/44477210500.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/runilesupifage.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417bf041632---16920695586.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/repatuvagoxotisema.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/fexovawu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/36101478224.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasimakenomafuzirijidevuz.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_F471BA608508526E.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341bb11c40d---43262153076.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/268b1867da034a8f50075bd59a9c7a77/rimitixevegu.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/gaputinarimesal.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427a7d2adc7---vewukilupijajaseregiz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c98c189f3---24920820083.pdfIn PDF document text
    • https://activepymes.com/pub/file/mupominunorajevalofug.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 10160 bytes
SHA-256: 8cf3c98b468e63a398af201d62e21f1f6200f8989b0f661175cef665963b2379
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17908 bytes
SHA-256: 65f36691e52cbdb7253dceb4009e7b27f49ee98c1a437d0998c49c645381e06e
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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