Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d28bfb21d2c974…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 07:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d049abff73965bd00e9075af60cd34cb SHA-1: 4231eaf85331f19f6b06fb26cba2cccaaa589e84 SHA-256: 06d28bfb21d2c974a99e839cb6de37a963bc970d7e0c31e9197e0ef4680411a5
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 websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://casier-a-bouteilles.com/file/83974984754.pdf In PDF document text
    • http://annabarons.lv/files/files/49881064038.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021071412460573499.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/filebariradagitu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c00db63d0---dapiludapixex.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q0m4e7dpah2cfbv8hh1jtuitv2/67802918210.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kogataxodegolotemi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0890cc1445---datosu.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zuripanadapidegiru.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/xudigiduvibiro.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8dcaf94df48a183fca773b6fdb8a1adc/togepixefizimifunim.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210806165928.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/21158962639.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/falowisudozopozerobejo.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/26986296759.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210804_005837.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3acb99deeb---mejet.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/42024562497.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/kidameki.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28658cc01---62476685929.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zafarun.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b37893ce---35097955908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spaghetti+poem+silverstein+pdfPDF 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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 11084 bytes
SHA-256: a8c2205f6063773f5cc2ca5abb23cc10f3601b6de67a32b91b94ec4b14e44069
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 17152 bytes
SHA-256: b057db10729c1d1ba3a06cff8edda788e00efbc47e5fc07b57f9ab8d6ea27eca
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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