Malicious PDF — malware analysis report

Static analysis result for SHA-256 54413e5268e9c105…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 04:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77d1072f71d2e2f0cff0f1ab328c5eb7 SHA-1: 75dff2ad32727869115c80ab6b784550e0d2cd5b SHA-256: 54413e5268e9c1050365bd99ce9412fc944045255d7f22dee9df4d3c911d6fc3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple compromised domains and disposable hosting indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=curriculum+referenced+assessment PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdbdb2a0b3157f3c22f4c68a53e8a49e/puzubelumamusoloni.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/51f1541c66d3135da6d311f94cc97273/gubegopane.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/setotikake.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e6c41665b3ed365d2e3c49339d730e94/lidogupusuxelibafotap.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sivusor.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gj5kahu4m9mkg8qhjulqofcff6/22387227545.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1085467fa32eea0cfc1e4b1bef7b5cf/44883195386.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/13645269451.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9a5a8f4c---kolimome.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/45529284215.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/30009231192.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/jobedokebur.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cd67fdc1---34194518175.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/fqt0c3pjbd1o4mqh0qqi6du7a3/fusivoxi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/papifapufogumalew.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/79583663869.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0378d58d---1585740454.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/daxije.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/vufukagozabefov.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4ec22c8e---burataxekex.pdfIn PDF document text
    • https://businesslife.com/content/files/jezoxoluvefasidojeg.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/wamopegofojolenajegunojir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10648 bytes
SHA-256: 6030a1aaeb7d47b59f8e1ee80f395ad274877db509b8338102ecd07c84e48d6a
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 17488 bytes
SHA-256: dc5417a3269bee68577a2704b8f0d4e5af50773b622984e85949a6ed6a94a446

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