Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cccd46fcbbaf46…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 09:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44a4b96bdd393d2c56f74d8ba4c3b306 SHA-1: b08e3e13f1e0d6071d8f66ea92f94f47341f05b6 SHA-256: c2cccd46fcbbaf4667d0687bd7911133860164e6f31925f074744ced54e5faa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites used for file hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://xn--hjrnskadeakademien-mtb.se/userfiles/file/83495812463.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f704931f4e---suvesew.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/15148619104.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a3d075ae1c1368bffc16c8da2e877252/8816972129.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/10289397034.pdfIn PDF document text
    • http://jiab.net/userData/board/file/dagunovobogo.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/zavosiritinizofo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f29dd658---xujalevafugegafibexebaru.pdfIn PDF document text
    • https://baptistfriends.org/media/20659821238.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/35326406456.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109252307286233.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/ladawemenuridewitaxepo.pdfIn PDF document text
    • http://pi-consulting.ch/download/98703058937.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095c77b33b---84775671637.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/bijaxuge.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/66428252371.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/rujesemoxadovetat.pdfIn PDF document text
    • https://parkettworld.com/upload/files/62741254851.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/ravasalum.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210922223145259.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/wemasowufewipo.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/69268786317.pdfIn PDF document text
    • https://hirurgija.me/files/63826473657.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/81792217120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=filmorapro+for+androidPDF 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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 10236 bytes
SHA-256: 111e4048a3ee35d5418608a62691861a6d135f601d7578313cc43a1cf4c07a57
font_01_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 15468 bytes
SHA-256: 2045254d4146c1f7d5217693416e88efd5a8ac3d5eba91d703da2fd6a62be26a
font_02_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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