Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8ba06ae626be5f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 04:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c3d160fba957599ff72223eee9afb53 SHA-1: 748d3c25efd6fac88e4dc1cbd2c44a7109283c9b SHA-256: ea8ba06ae626be5f82b12a3c09d0e7c73994c6f517ee8a49e19e389649c25370
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, indicated by its small size and image-heavy structure, designed to trick users into clicking embedded links. Multiple heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of PDF-specific exploits and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kawanmto.net/contents//files/28919256376.pdf In PDF document text
    • http://test-immo.com/file/20877481888.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/fumonusa.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/30651435207.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gisijixikikosorefatu.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/50364311632.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/99272027040.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/41723381052.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/fudepusulumopugut.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6b75182f---54555062905.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/doves.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210802_AAA14C05448F7025.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9edc665c---49025036390.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611962774eee6---lodapesimejobununu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/32081274535.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13cd59116---6860259409.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/urqksbcsfbacl41argun8tmak0/bajadeb.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/49757603724.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/kuweba.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/83612261034.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8bf56e4778b5dca5d24f5c9bc25cf377/fakesidasezilume.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/40618716189.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdc8056c6---15292492894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+printable+ela+worksheets+for+4th+gradePDF 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_off0000b3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 14396 bytes
SHA-256: ae412ce3dc3cf2b935569fad5f2dd3eb6b49ba65a52ccb3993b17ec5c2a31b26
font_02_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 11148 bytes
SHA-256: c3642fab7fc749da3f385ed6def105ac5fc06f51c2771eab95d5180718aa21ed

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