Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe2857ea0ba51f1…

MALICIOUS

PDF

91.8 KB Created: 2021-08-13 18:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 55a6edc1bd0f0a478c6600e0b46b459b SHA-1: b894fedf0d22f24f9183a29854777b088dc09289 SHA-256: cbe2857ea0ba51f1a65418a325ac3878f7a5914048cff9c558e4ead7b4e3e87e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as disposable hosting or potentially compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings clearly describe a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bygreenpure.com/userfiles/file/wawatexemivufa.pdf In PDF document text
    • http://www.thaiboat.net/image/upload/File/96247182681.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/jobukerevejalebip.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71d168fce80154f98f7b09a6c2dfe7e6/44533530899.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/rodulubemojituvo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/481f68f6ea4807c42dc8f0a3e4eee6d5/batefin.pdfIn PDF document text
    • https://sinarwaja.com/account/files/sikoxutuxenadufesanaxugaw.pdfIn PDF document text
    • https://mmszke.hu/files/file/67303317167.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/zaxudew.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/kavizajitobuji.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ia7tj5kjsc156ih25lfchr0a16/89116421330.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cd218b8ec---2078362423.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nepepamifaruz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9504ea127---sotakozide.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/36388258417.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bakewadejuki.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/46379196132.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///petagesumasaxawolep.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/26156050384.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ai0ha0efule9p7u9m6hil4838i/83928067088.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b85fe6c4e---36474832169.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/dizafixivigapagi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db562b306f1---23716599399.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/47817699683.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609659f22bcb3---97156891771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+point+slope+formulaPDF 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_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 17956 bytes
SHA-256: a8b3e1811efa1df76636ca2e48476d3fc7ba65d9fe07fd8c55155cb59a9aab39
font_02_sfnt_off000147d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D6 10696 bytes
SHA-256: 54f449275d1276f4984254bc848aa9c74a7c5d342224c89360617e9b9b53c048