Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1652599a2af7c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 06:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b39bf5fe68f9824c53cb9f30ac098ac SHA-1: 0c5afd4d1ad5a2a847a8d5c45b73476f02eae429 SHA-256: d4b1652599a2af7c0d3be66659f90d82e903b9906cc9728c7ac99bc5c698b4b4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and remote support lure. It contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure and embedded links indicate a phishing campaign aiming to trick users into installing remote support tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=ccna+service+provider+study+guide+pdf PDF link annotation
    • https://tannhatviet.vn/upload/files/34480967102.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jutisux.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/59990297819.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/vikiguvebijibajerapapino.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411ba9ce3a9---7487056866.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68a64bf6f---bozipulaf.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xijukibemawipar.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///38515496816.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/vuxobobewovovuginojem.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294824cb68---91263934751.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/52260322513.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/wotaminopuzejepewugamo.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/26442721468.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/pitudirefokorajudi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131404967308---69846257985.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/megifogavovat.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/disuzalebojezid.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pudesikofivetabiwirofob.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/xajotukulo.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/loziz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274ef2c7d1---353749205.pdfIn PDF document text
    • http://elitvorota.ru/f/file/53555563607.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109110403113857979m8i21.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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 17436 bytes
SHA-256: fbb449a5f94acd45141a44dfe25912f9f8063b37f5e0d67a5c9cea36ec630813
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 11060 bytes
SHA-256: ee15aa948f4b4790e88d69b4e35161b06a1202e9237364dad8337f59766ba292

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