Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c23aaa03e305eaf…

MALICIOUS

PDF

81.5 KB Created: 2021-10-06 03:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d0247803cde65f84479375b046d7337 SHA-1: d71ca8048471644e011b7e25d709d73293e8c2e4 SHA-256: 3c23aaa03e305eaf9945a95e8013cc687184cb18587fbd9ed00a4a8920d2969c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=deoxys+cheat+code+fire+red PDF link annotation
    • https://clubberia.com/js/ckfinder/userfiles/files/fajomojagawasizit.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210921032521_wpelcj.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/73194613818.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090805023273499.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/91922530036.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/loweketabopa.pdfIn PDF document text
    • https://iohrp.org/f_files/files/telalaben.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95503843493.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91149715279.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16150c8735dc11---suvusateja.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vebot.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/69801824702.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/fokuzarulifipilukonowen.pdfIn PDF document text
    • https://agros.net/uploads/file/naxanuve.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/puvedejegugupanej.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/keribagijuz.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/93940918759.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/bowamusudedi.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/21824928910.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/77452566268.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/42525262989.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/75856494094.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/leranuzosu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2ade7520---99979237032.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16151ef3b939e9---6079476367.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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 17316 bytes
SHA-256: 313dff0931e77dc4c55cb90d4bb6f47c4fe280baee77f4308311f5aad4d3a555
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 10640 bytes
SHA-256: 1db9a874b70af990c3a946c08b54416e047357bd0517c6e5998f9f9e01f40334

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