Malicious PDF — malware analysis report

Static analysis result for SHA-256 4394c3b5347a8d21…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 02:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e198367999349cadf686520735ca45d SHA-1: bb9950f1c920df30ae644a3da693f32c0681c753 SHA-256: 4394c3b5347a8d2192ce450eb1d51d5d6dcef4ec85783f0b8201abae2a5d102e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tedvandergulik.nl/userimages/file/74247429843.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d5cb83452f3c74b3550ace789963c950/22051896237.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/62704957428.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/favidonetixididuviwejov.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0a6fa12c62fede3c317384d0c43a697f/farawemonumivuxoge.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/sesemuluxatimu.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/gitozutetomamugepe.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/18176600188.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d8ba22163cce45cd00fe2f54f8b79290/wajumab.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f90e2cc62932fd075ce26c01c26ac9f2/11405828815.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441dfb5dc6---bubabifiku.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2qne585cbuj03en9a87c34r9ps/32255355730.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9v0oc2q0ieqv4h8naf0klbq9ih/rewajiluj.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zizexekafax.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a997131ba6---90322808156.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6undke6k4bfs1641esefkegac/37403167388.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/getubopopipolowewoke.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/10321873454.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/34714184871.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/63p2us73ato7nas4qgduh06ce1/tirevisubapuguxisa.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/tiwerinasijatuwok.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb21103df---74951189856.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/derabimogi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad14d5309---75293724101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=c%2B%2B+for+beginners+pdf+downloadPDF 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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 10832 bytes
SHA-256: 2eb6a1ddd99eae14f61951613aef1ada84db532d73478025bac2f686e6260303
font_01_sfnt_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16196 bytes
SHA-256: b64b5fbcb1c1c4f1280981b1fd00ae4e400829c0ee064149ac4df8afe5c6f52e

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