Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be0d10ffb83374c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9362578c9e13f77c04c1effd7235ba48 SHA-1: d1e4ac6f371704c4263bc9c32869ddfaaab8d34c SHA-256: 3be0d10ffb83374c631749ad0ccbca693b9aa7975eb6ca822a496fb25a32928f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdf In PDF document text
    • http://abwrichmond.com/uploads/files/lekofijujupevijukomomuwi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a5e3677---77851238192.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/zovomogedusafurud.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210907_121606.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/disogolej.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/47167764665.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/75130825979.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zediw.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/manerajekobir.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/luxapawev.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c0ca15cbf14365b07b6f2ebaf520bc4/96420064754.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/45574980543.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/21224466550.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/noremovokiz.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/37028105817.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/87094966786.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614031756325c---31531460293.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/93781936319.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/87862848756.pdfIn PDF document text
    • http://learningkey.org/userfiles/82364932842.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/fidafujesiwegiguwavofad.pdfIn PDF document text
    • http://bjjiffy.com/upload/31902022196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=solo+launcher+pro+apkPDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 10380 bytes
SHA-256: 79502aab4f933596a57237c72687ea0d150cb531a7f6677a793a6fe87a3cf58d
font_02_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16868 bytes
SHA-256: 5c29c496c395ab854da03428618eb0bb23bb533a8e74e3b3d62dbd4a53e468ee