Malicious PDF — malware analysis report

Static analysis result for SHA-256 653694c73bdc2985…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 16:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 496314a16fddc66e5b0b4e4de7abf857 SHA-1: 5464086e3f77e367ceb8e21bc8427d738abe64e1 SHA-256: 653694c73bdc29855db96593709fa8a0c97165788c1468c69d106e33e5be1172
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to a compromised WordPress upload directory, suggesting it's used to host malicious content or redirect users. The presence of multiple unknown URLs further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e01e3c91---67635707880.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ritojolutu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/weseveligebajetivumam.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/35036017705.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lakewidipodobifobuwik.pdfIn PDF document text
    • http://effektfilm.de/files/file/64863465737.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/ganelotizajuwusepe.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/83610271774.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/28ab6edaf79b448bb97e0cdfa1deae78/gugaripe.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/sadagobozojifuzabebo.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tefufisazawej.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fatinimusad.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/levulepulotepalotur.pdfIn PDF document text
    • http://dd-eng.com/files/files/tapitovukibewajob.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b9ebd7f---59858409999.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/60605750518.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/wavesodulutod.pdfIn PDF document text
    • https://cartolmania.it/file/80200765035.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/33892704316.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/1999394300.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zudamewujazomupow.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/nufogawuzibedaganeb.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/dixexubomutukepure.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/91976507967.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/perawekuvogekeromegevitij.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42124022751.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/68642292260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=battlefield+android+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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10320 bytes
SHA-256: 934fe035f9617653871460eddd723189998e916bf323f3907785a733afbff1d7
font_01_sfnt_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 14664 bytes
SHA-256: 26a25ae9734c20ef86441777f044c4f49c9e5a436c5a7fcd562ce7e7f3ffd937