Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d36b2143f4329d…

MALICIOUS

PDF

82.1 KB Created: 2021-08-30 17:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b1f3ece77dd4ce4bf0da24d5cf94885 SHA-1: c00e456db76498a45642ebeee859ad5bcc7e3d32 SHA-256: 85d36b2143f4329d5da88d341b222901ba75c296a29f4cd498e072201ca6e9e1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and links to disposable hosting further supports a malicious purpose, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=anomaly+detection+lstm+autoencoder PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5bbd70a7---51141716237.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jm61k9ejpqriht5fckgs0o6bu6/wilumukefojarowupada.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/b1rbq2okkgi3kvtr90bi7r3s72/fifazuxi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/28603152906.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39e506077c---nizakijamami.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b479e678---79373361917.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7jq10rvf7t9qvlbp3sj94ehvcf/futivat.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/wigemel.pdfIn PDF document text
    • http://promador.pl/userfiles/file/42363020575.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/47973717600.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8733a6b18d---98791335706.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/58969896980.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vetoz.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/26434407939.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/varajumorugevadufates.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xoxufurilugazidije.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210721_040932.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wudululejozotadijo.pdfIn PDF document text
    • http://aps-mes.com/files/file/budewedezelilanasepineme.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/62058576720.pdfIn PDF document text
    • https://eternalbliss.net/file/pubisiwatigewurerifevu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c9d7c4b6---5857817084.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/vuvojiruxutugesojimewoso.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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 17720 bytes
SHA-256: c03ca124a4a7fd9e051b30b7d3e0940cb28179b7f0469de524e5472b114b5716
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 10724 bytes
SHA-256: 97c3674009f4f3a32e4f3815d724ef7148eb8226ec5aad5a0b700293768ebc5d

Open this report in the interactive analyzer, or submit your own file for analysis.