Malicious PDF — malware analysis report

Static analysis result for SHA-256 f584f7d6a0af2ea5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 19:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e675072cb7d41803c9fe373943b79f8c SHA-1: bc3208aef9b279876509903cf76f6f61091a7b16 SHA-256: f584f7d6a0af2ea55ee3ae7daa76a82ddf4aa1c33b3a3228e8a0be7d7b855fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16129ec901bf32---gopopibiga.pdf In PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2fc926974994d7f512d736e26c237457/pisilinukali.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/87750534445.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0i66i65rs42gjp5l11vdqval5/nojorovek.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rupanarikijom.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/sevop.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c144f1e8d64---dasixejujenota.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f55a61b36---36016250825.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/26342970671.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jagelugunususujapusir.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/69792683849.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7rulgki2v1506cte3q4m4cea90/37196771451.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/rudew.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/86649744427.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/97044910929.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepevejawadozekox.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61064610ad---tutaposuna.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b3169a400233ad71393a211a94ed378a/mitikejinowozuzumoxuw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abd226fca---waginesonika.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210720_140557.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87837787834.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc8284316---23262947519.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/80866673842.pdfIn PDF document text
    • http://short-story.ru/upload/file/sulifutamejewizaxurupot.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103c55dc7406---mojidufuvojiror.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nugojimakeguxijaf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7302a0580a4569d3531c6b2c28fffab5/62978952833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=conversations+with+myself+pdf+free+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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 17340 bytes
SHA-256: e694a48ef938881917a375b11267b87e2636fb347a85764082f4d2a56d6fdaf0
font_01_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 11060 bytes
SHA-256: 0648078712eb007cff169906d51bcdd24bc9960397c37ec2cfef17bb0bd7d156
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1