Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cce3369759446db…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 04:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cd39ee681cc4892f758aafc966cf824 SHA-1: 607daeccbd5ba9aec7bf4a699f93a9687c35f4ed SHA-256: 3cce3369759446dbb51d1e4bedded7da407ea409918e1d8bfa6000ec7eafe69a
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a "download button" heuristic further supports the intent to trick users into downloading files. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260081bc90---vavesidizid.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/satefudevugegaxanigovod.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kadufilozoxerugivefipami.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/26073151778.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/97032077153.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lexesegiporibivok.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vebojijifuripupele.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de0e701dd---relewadebedomovevomotowok.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/turaliwesajekofezokod.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/14076998395.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/pizofiginadibal.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/91195438795.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/66639145280.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210914081520281.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091115270373499.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3169188051.pdfIn PDF document text
    • https://termofriz.rs/files/medixi.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/powapivejalebum.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f25feb08e---fedobolizoxuti.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/bedugutezanapurara.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/vawod.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/4559873174.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/28556683347.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161370db51286c---73421969186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=egwu+abuja+mp4+downloadPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 21160 bytes
SHA-256: 39c56d07d6512f7fb1ad6576cb522a7ae0086734435a5c43edfa7252df7d83eb
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 10664 bytes
SHA-256: cd790771065936e28e7b49fa304d6d2b6a6e29514736c2049ab0f948303c55bc

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