Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca800e55c60cd9e6…

MALICIOUS

PDF

80.4 KB Created: 2021-08-15 19:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5a76d484b04dcb3412e67bb6ebfc46bb SHA-1: f824526c7d1860087f7083ac4068f5306bd03b77 SHA-256: ca800e55c60cd9e6ecf6241fc2f711491ab96cedde7bd6e89a8c69ef4bbfd11d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious content or phishing sites.

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://drafthe.ru/uplcv?utm_term=how+do+you+get+all+dinosaurs+in+lego+jurassic+world PDF link annotation
    • http://novelinternationalschool.com/ckfinder/userfiles/files/38510425079.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d0d9531f36d72cb2a9558c0580a6e10b/62616006551.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ec6d05fd---sisalawajetowizezezezube.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0f36c6923bcbbd2571803acd13758a3c/saluvivekuxasudibapo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a7qmfsb9gfg876f0et8jb6tr84/dujibunawir.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/926e980cf26ebe221ab37e9710b4847e/85961048869.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ccf363f21---regegizudatorokijijiki.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f376bb0c752---xunewogapixexogabitomup.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac679c42a0f---jupel.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/jizalezafota.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/nasesavewinepidu.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/64294915409.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/20104256049.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/72205686382.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/betekuzikakadolip.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mhqnr1a0mmd8h1up42dficgnbb/84654677211.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/dekefanememipanefunuzaw.pdfIn PDF document text
    • http://torgoborud.org/images/file/80886483166.pdfIn PDF document text
    • http://digifast.cz/userfiles/duxinifaratigere.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/japafuragilerozodoxizoru.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/65952471906.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/22464270923.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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16420 bytes
SHA-256: 376e7e5f63527b6746e2686be6785d103d9f55608793d445a1d1f8082765997b
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10964 bytes
SHA-256: af5b17011d222220816b303f62678d374aea68d9c63f3799fb4bb4f18aabad93

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