Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98716489235f2a6…

MALICIOUS

PDF

118.5 KB Created: 2021-09-13 21:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06fe8b316ac27a0690633b0b5e94ee1b SHA-1: a00e23550d9c9be803680b13bb79270a369697ab SHA-256: b98716489235f2a67c6f46c76022075e306f24161cc667e76462eda7d6b5d1f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm strategy, with some links pointing to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rooptex.com/uploads/vobijerube.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/80781126149.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/86802577497.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/53050560102.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://vmkmsz.hu/userfiles/file/80758724823.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/zozokusodexijuxodawupotu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • http://dnepropress.net/files/file/kifokomexipuvanu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/29721487935.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/6690648440.pdfIn PDF document text
    • https://rinducm1.com/contents/files/26236746384.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/79680990672.pdfIn PDF document text
    • http://belean.pl/userfiles/file/saxosujoxuzupadode.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/pikosilirebugasagukukexis.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/mudebevukibuvos.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/93410967250.pdfIn PDF document text
    • http://synowka.pl/galeria/file/9712814972.pdfIn PDF document text
    • https://zagi.hr/files/45637456850.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda23a6ecb---78421807240.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c23ba9d240d000785a1094c7db767309/56612526340.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330427dcb79---jokir.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/69272022879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=marvel+contest+of+champions+mod+apk+latest+versionPDF 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_off00015ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF9 22120 bytes
SHA-256: 2be15ef00b0f0a9990f64a3e7fd153ed22330ef20fb16aa3a7dc6f1f888420b7
font_01_sfnt_off00019a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A4A 11036 bytes
SHA-256: 4fa26e1d8edbcb72b38524a599dbed09aa59efec3dad335efc094f11e4df849b
font_02_sfnt_off0001b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1