Malicious PDF — malware analysis report

Static analysis result for SHA-256 283698518e4df1f2…

MALICIOUS

PDF

91.5 KB Created: 2021-09-15 13:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e06a224cc424e5df56493af6ec63279f SHA-1: 2312523675c43443d219bdb7506242924664cded SHA-256: 283698518e4df1f2148534af49c577e0dcee8e3d4aae624a830c5dfaa431d086
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised websites and a fake download button, suggesting an attempt to trick users into downloading further malware. The presence of external URIs and links to compromised CMS uploads reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parkergeneralcontractors.net/userfiles/file/ligoniroxat.pdf In PDF document text
    • http://mbfeed.vn/upload/files/18392805891.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/sezosuzeg.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zifuligokizom.pdfIn PDF document text
    • http://inica.org/files/file///kerog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t82opnc7qs3m0cnpbeqp5roh67/77025409078.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/vufotafudodu.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/vukofijatu.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/15963595050.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a7c6b032e---83415855071.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/notidorupudode.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/51534697595.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090914442623.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35491597955.pdfIn PDF document text
    • http://mdtrend.hu/files/file/23561700954.pdfIn PDF document text
    • https://atrax.hr/files/34953823577.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/36928632442.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wuxusepelojokefomi.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/11566106990.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xadavobuse.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e37bf908---fuxemukizixot.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375725a7453---fesanukigeb.pdfIn PDF document text
    • http://odumakus.com/uploads/files/kuseresorirugini.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ggc89dmia9ubtquv7djsdp8jf/35303504602.pdfIn PDF document text
    • http://horvathortho.hu/tmp/99885613364.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/72197107911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+123moviesPDF 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_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 10776 bytes
SHA-256: 2ff5151e87a67402ed10ec52968f47b966c01884bc482c33748a43c60c6f8ccd
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 18256 bytes
SHA-256: 81860a8e7ad079b70249d93fa361bd99826dd92b1c9707f205c2256b9e33f520
font_02_sfnt_off000146ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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