Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d76a4145dca21fa…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 03:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0dbf03635d481a24d198447ab60d998 SHA-1: a36c79f9e0336157b108b87e3f9c1191de8f9574 SHA-256: 0d76a4145dca21fa4c39ee21b647685699bbd05b57d3fa863ce4e5e9458bc583
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://lecieldesandes.fr/ckfinder/userfiles/files/16130100149.pdf In PDF document text
    • https://sanipacific.com/attachment/file/nuvub.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/pajovowijuwiwa.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210910222120211002m5bryf3glo8f.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pojipapebitotusenozuz.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/mivedafakedupofujaz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47e2a2663---kuminigekikuketavowovijeg.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae74892d8---tatogurewugor.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/99526005001.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613826eec6a55---vofadavoxod.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/kefuvonijo.pdfIn PDF document text
    • https://777mto.com/contents/files/29704390865.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e3d6d68f37227fe60cd52d8191757f7d/monebupopimogasulezev.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/54388269593.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mupavufilu.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/10899247635.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/videla.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/35197101116.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/18167825317.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///71019769164.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/45304417124.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/sojesemegatabasukasu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28219508867.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_BAF3ED8AB9FD18F6.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/18c43fe09e406d5418a705eada7fafdb/14494854258.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/68543785647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sonic+3+and+knuckles+rom+hacksPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/72804001689.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10976 bytes
SHA-256: 1adff86e4c1084f60c12145b0f8a8be0c1eafbd856273afccac75e9e4b4f1f64
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 17012 bytes
SHA-256: deba38b11114e56732b474cc2863df5537ca03171d22ac1a3a0cced80df810df
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1