Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a52ecb8f62e9b1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 06:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dbdc80b30fa1579a4f1bd99bd73a4c1 SHA-1: 8859204ce08cd408fae35d9f4f1f9361bd1ea77f SHA-256: f6a52ecb8f62e9b1f7ce4fc92cf7dbd6b4dc7205ab0c8f274356e45a561e589f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads 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 delivery via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=william+penn+and+the+quakers PDF link annotation
    • http://tapestry.cz/images/file/files/20583217301.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/31633008815.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d511d9169c5---49420349577.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/dolanexen.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a901733661b---75317505279.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/91704226197.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kadibekis.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e7457fbce00c7f9c6934681d69b41593/pibexipolumaborit.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/jujadobipexewotamafa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60149e39d1---54946777174.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/robupevopu.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/jakisosigejekojezupafoxo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a357eac2473---59674535925.pdfIn PDF document text
    • http://isleo.com/i_photos/file/waselubaf.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f65f87b72---vafavavef.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ded30f05---nixezibedanulexuza.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210817044303.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/mizojogulovitifoxojatij.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/13499530002.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/56152399415.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b053b05---26416518806.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/29140523806.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kkqo8utdm2p94ahi59ruab88d4/68093821810.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/94636590502.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10868 bytes
SHA-256: ff4523eddb6ec1ac9d75ab9bca3b4cf2e0e2ef6ce7773ba97c0dd8ad0c2b60c2
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16856 bytes
SHA-256: 16cdb570c17584c31e77005ffa354729c350a37c5f87d190941ad8e6ac964a72
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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