Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa06f1d8e7a39c5…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 19:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf1490650c92d94bc1c399422761d269 SHA-1: faa1a7df1f75f70c20e9874c7968311f34791671 SHA-256: 0aa06f1d8e7a39c549dd8bc580e60257190435907833111915a58b06a09221f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a single link each, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.l-games.jp/js/ckfinder/userfiles/files/65583028496.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32361ab49d4f94ba9c92065b67da90a1/32792150987.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/xesetuwosuge.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/puzogufubamanu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2983b80f20eb4d33630f7900dfca54ca/89940961963.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1547ed30---10247847239.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f2a1c3beeb3819672038708b53fbfcbd/41079970038.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/41955925711.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kusizapunabudelerateki.pdfIn PDF document text
    • http://llux.vn/uploads/files/tozezasizixotudepuf.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rewoxekurotifuwinixuk.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nanibi.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630803847.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/40130410148.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/25110217198.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/wavomugajijezetino.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/nurusepobog.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/98411090759.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/xopugukogipidadare.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/28031491712.pdfIn PDF document text
    • https://conrays.ru/f/data/24824703631.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090701162673499.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sovak.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/ladinozanaxizobonixinil.pdfIn PDF document text
    • https://redac.ch/upload/44430874667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=igo+primo+android+1024x600+apk+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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16460 bytes
SHA-256: d7e4bd37e10bef829f14dfc62fc09ae42f4240c87c662db052c404bba71524a7
font_02_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 11108 bytes
SHA-256: b14db5c26f5d0d7cd925185ea1ba25712c461c692b906367a9818cedcce51f24

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