Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc02343015ac398c…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 07:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e503d66c02ac46c44b091e0cafd05d0 SHA-1: 7660d965fa4537eeb790ee1b0397253b0c0e7274 SHA-256: bc02343015ac398cd4dd2e74d26b3c6795720d2b99b5503f6a943fe65fe3922b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The embedded URLs and link farm structure suggest an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=moto+racer+android PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rfsppilhpg7ln63iu8qcc72pci/jidapazo.pdfIn PDF document text
    • https://razredna-nastava.net/files/59001120775.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428540f2b62---268487383.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/ruxowomerekepuwifivo.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/21989507439.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3772a8f6---ruzobaliwen.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/rataxizumu.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/dumonum.pdfIn PDF document text
    • http://tzsunup.com/upload/pakov.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/vomuwinawebagevewixu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s4mm1q7nhlu4bp2osvd38015s3/51761437810.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/lirenirirowofanuwemom.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9fbfedae2---jatoperumonofaru.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/wewezom.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/40677134267.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/koriwagedikazajufekud.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/ponowik.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/semowebafibibajinirejez.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/xewupaw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/nazibud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/10718955237.pdfIn PDF document text
    • http://hk-keber.de/images/file/9364165371.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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 10144 bytes
SHA-256: b49453ccc9bc5225c0a0af43165a58d4cf3a4c1ec190000294d93054cae7337c
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 18980 bytes
SHA-256: c14b96702d1c7e01d35c665f9cb6f3f32e6536a0d2374ac6cbd59ac091064cd3

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