Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d68edb199af1495…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 05:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8bc28ad6cb638c4d08309e09ff2a4ed SHA-1: 90e8f427abff3db13f647de475450f866fc36871 SHA-256: 9d68edb199af1495c4a7b3b4f2b0ecb3d7f62111baf1b36ff507cbb447b46901
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dc7aca11023bbd7c1197445bdb07140/52295465184.pdf In PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/52966558268.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/vibekuzupigogarapisew.pdfIn PDF document text
    • https://stopserv.ru/files/file/54184092212.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/revesujurakexuwikuseda.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/61709829119.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29191b605b---3740305109.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2d95e5db---fenazuw.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/senituj.pdfIn PDF document text
    • http://cortabellanews.com/userimages/35163761221.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/wazosopajuj.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/69025449079.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/62919071066.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/55978313430.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa505eba---tonewezarutivoloxovadenak.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/dekelagewolobovof.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160905df8127b6---72475781736.pdfIn PDF document text
    • http://domplus.su/userfiles/files/wupimizikipivu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bdacb0090---renebosimedigevijujaj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfa4bab01---92938903151.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/jasizedugumuw.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/bifaxomobebeg.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e67bed8eda624bd2fdc806584508984d/wufevadavorojuradozil.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/41279713067.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6079dd527b1da2079dd4fe0285cc4d78/vubexubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=investing+tips+lesson+18+answersPDF 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_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10792 bytes
SHA-256: 952cc211c1b885dbf789b9c3e4363f670f729d548591d083211c7a17ba14b534
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 17232 bytes
SHA-256: 7630895c941846cccddf068491d588d45308d67b2c2479580302ef2f2952eb40
font_02_sfnt_off000140f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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