Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b88f8831d49a8b7…

MALICIOUS

PDF

85.0 KB Created: 2021-10-08 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebea9f4f195e44e586e8ee7bce3c29e0 SHA-1: 239ee4322183babffbec5e9d0f14f7df7b09bfec SHA-256: 8b88f8831d49a8b7279ff578da39488495d3ce8b75eaee0911351e37996e9030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed to obscure the final malicious destination. Heuristics indicate the PDF is likely a phishing or trojan delivery mechanism, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bacninhonline.com/webroot/img/files/81166401794.pdf In PDF document text
    • https://tenhucchi.com/upload/files/jebalopiretabatijir.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/98169008326.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/panimawozemidabuvovinum.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/zimesuguvapufu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615daa06722d7---xaduvoserubim.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/kodegipixijodoruzakid.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lobodulikesi.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/fizirurivopaporuwaxi.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e8e032a8894f944b1afb58bb83382fd4/94147439636.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/28436205197.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/lemepanipepavinozoku.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jorojekizunazizuki.pdfIn PDF document text
    • https://patc.fr/imagesfile/pubopebibafobev.pdfIn PDF document text
    • http://seamacros.com/upload/file/dataw.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/daxozonaputabuzo.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/ziparifutulamanebi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615d4618d500d---xigosupukegerupu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/vovige.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/33aad3d7a944dcbb6bb94532688ee92f/40032569705.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/rujugurujazesuvenubuxixu.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109160211589332.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/44175229587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=csf+flow+in+spinal+cordPDF 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10500 bytes
SHA-256: f4162da810055726f8967a303cc331b06b96795ae59a9dd6e5d9c057939c976c
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 18612 bytes
SHA-256: 2576fbbfe7120ecd6569ad3def59ad6f7c21a1237cc64c2c3e89beaf36a50d62
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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