Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176afc2a91f9aa3…

MALICIOUS

PDF

90.0 KB Created: 2021-07-05 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90771ac1e555223c3eb2426e154b912d SHA-1: f0347e3901069db79f276b0d379175c9330288c1 SHA-256: 8176afc2a91f9aa371669c2bca7d3322ddd1cce2a9ec6dc908c5eb32b3fc3cdb
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 compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-distributing sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.saito-ken.jp/userdata/file/joritafibe.pdf In PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/87162724816.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/warojefuxokojonagisobal.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/98493497449.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sceptjlt61go2hm3onmujvdf6j/kigusiwifalud.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wilaxifalujowi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b32db3c1e---woxafumojov.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/laginasogobapitegaraz.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/velorufudiv.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd38190e2---11637462500.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926bc15a4ff---4216749170.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/pukitik.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tuwivog.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c345e5659d8---figuwelarusetinuxaz.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zixajajorowozef.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/48039543134.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sifeweputopebilasapan.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca799bcf6a---5489193130.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/molaguketovox.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/83406943518.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/sugorudurabu.pdfIn PDF document text
    • https://cecprint.com/images/file/nukam.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/mixarolijuxudep.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607996b6e3af6---68200913224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=giant+thumbs+downPDF 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_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10600 bytes
SHA-256: 8af0a9a910043209ba22a5709080884d4cdfbfc8d7772c4aa23e5b4487a8985d
font_01_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 17160 bytes
SHA-256: 4a3e6a92f0ea0fb9d46492bad1110cbb004accfe95ca6bdbf1c0cde862803f51
font_02_sfnt_off00014291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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