Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb5e4b76acc9799…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 14:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3cb3f086099e516a6c2dc77743eb752b SHA-1: bc05782c052cfb6f23ba8ac4c1b5472f2eb419b9 SHA-256: edb5e4b76acc979901797631999719e021a7d4c2358c4e0e416778aafdd0d578
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads. Multiple heuristics indicate the PDF contains external links to various domains, suggesting it is designed to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7s9jjtbi8d9kgtle4i1h613nc3/91265812409.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af26bb3aa---gezun.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f8d0f05dd2026a79f048632e16890bcc/21068390199.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2d4bcd6e25---xetevamonuxerazep.pdfIn PDF document text
    • http://hibertek.com/image/files/20210618_011320.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16073778f4ae72---zokuzo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/114ab8678f3b2d0f4731116abfd60ae5/4691797444.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a63dab44945ff1ace426ad59f0bf80c4/96899392274.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1e082fe4---99321081909.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vtjntg1jv6ssgc2h8m3mgtd355/18591630107.pdfIn PDF document text
    • https://artbynela.com/uploads/file/11024860277.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766dfa7068---65951858903.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e4b6c944---petokal.pdfIn PDF document text
    • http://15889163.com/ckupload/files/rezagelupe.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b381985d7---webesiputozutovutadu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fepijivixazegagidawegem.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vokidurufuvo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608246f8de520---zuzakeze.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zadisi.pdfIn PDF document text
    • https://x-software.cz/data/file/66078821374.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/damobi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a70921d9---45163347468.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/8863245926.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zevejuxalowovatamokutevox.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607474054d817---xofokenalijiniloluzora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=health+patterns+assessmentPDF link annotation
    • 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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10296 bytes
SHA-256: bae7ccfca79d2e3a276dc5385a871650d48b343e21ad43bfc7afd65f75d0db12
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 17400 bytes
SHA-256: 4c5a5e3114e7ff9e19555a1b1f8edf1f2e61566bf1c12297ee5373c02c1a130a
font_02_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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