Malicious PDF — malware analysis report

Static analysis result for SHA-256 80190664d8baefdb…

MALICIOUS

PDF

96.3 KB Created: 2021-09-19 02:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b9de7a2550b4109c55677c0001735b5 SHA-1: 52db5a6de28f671d46167897a82cf9ceeaff746d SHA-256: 80190664d8baefdb390b3e5f3fe9cce3564d3e41b74e60efea1bcd2088ebd7a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jcnjl.com/userfiles/files/66578716738.pdf In PDF document text
    • http://shendaoguoji.com/data/attachment/file/lufozozuwekosiwopo.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/27935402851.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-14/20210914055932568642.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/67876278061.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/sipubuv.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/59077730784.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/1300864732.pdfIn PDF document text
    • http://vodova51-53.cz/files/20181907142.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/19103564093.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xovunos.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76545561755.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/28237418559.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b53b8a87---nemategisifoziv.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/16665630493.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/85080350805.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161413de7602d7---rerefasagikum.pdfIn PDF document text
    • http://gespk.com/userfiles/file/8146281846.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7e7d9e3d2f9d4b536593cabfacf68fa4/80129092660.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109132145389794.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/91259817300.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/wijiro.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143038af3189---37810596251.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/bapajapekunaler.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31874546903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=followers+finder+for+instagram+apkPDF 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_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 10996 bytes
SHA-256: 6e7ccf6a3f768de5d3789c6528effe38942c157f003fd1c08a422fc29a7d56d0
font_01_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14353 18416 bytes
SHA-256: 81f943ba26abee445ef856394b306e4bd183a97220a4edd7409548b5c329def0

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