Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3495b3aa29f234…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 23:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b81e0c9263fda9f9f09619bdb720eb57 SHA-1: 25e1a5df631453957f10b15abfbee01187980c80 SHA-256: de3495b3aa29f234e259d2c35466bae83156c1b608f9c748969077dedc55fc0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including one disguised as an Amazon Prime Movies App link, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest the document is part of a link farm designed to redirect users to malicious content hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=amazon+prime+movies+app+android PDF link annotation
    • http://iltorg.ru/upload/file/35485761010.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kavubakuda.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/8314395843.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434bc41ca40---tuvuti.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/relabivegilovilodefe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/88b57ccd2f40508a3ea0c28e3248692f/gogudokigaku.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/kigabopazosozenido.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210915173140.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614210df3038d---jalatukozugapuvelo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/45405156320.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/desumofijen.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/79634375840.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wuxibiwa.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901132127.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109190136058909.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/52128674713.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wuvuvarogaxafobowaz.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/83143704673.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f9sue0ilt4ilnaat4lv1gv2ul1/suzowege.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/7389359962.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/52487267253.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/61156750948.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161416f8cd451e---dotakugamuzesuja.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rozajibinibiguzijidub.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 10516 bytes
SHA-256: c69a60d856d6ebd82288a8d56a0126d54ccd43429b68d011e50a5065e08f1cc0
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 18076 bytes
SHA-256: db64d99060d5c5ebcc14fc082eda18fb984afc5a838ff702038a2cbaa1151318

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