Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc3f958e4f03372…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 19:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5827e2bbd4e7919fc1e08c7f47b888b SHA-1: 02acf790d1e0c7b07f5efd496e63bd5791babd25 SHA-256: ddc3f958e4f0337239676b64b30c1e77bf74cb10901bacd4aea48f4774daf261
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://dongtienlamnghiep.com/upload/file/rupugi.pdf In PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/rifopuju.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/natexanisorujog.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/81339546187.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/99669838541.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b0ed547745bf74172b4e91d4961827f2/75863495615.pdfIn PDF document text
    • http://rnralpha.cz/res/file/wurunefojuku.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/lefizav.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/99041983203.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nijoguwanuvivowav.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/74972891764.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/bilozejusazu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/weputedoturesaj.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/5848666553.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/51662818521.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/koluvise.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161338d8d89a42---28237408930.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9igu6v3g660r1mg9kt4rnpo2ml/goxixapax.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/14569957740.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kifanuno.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/53216148925.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/41413842063.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/28852071140.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/18142335986.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/7792720351.pdfIn PDF document text
    • http://edeins.com/userfiles/file/nolaximovugixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jind+meriye+movie+watch+onlinePDF 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_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 17052 bytes
SHA-256: 947a1f7bc726edc7e95181809d4bafc6b5cf02737eff129302cf97ad32101bad
font_02_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10724 bytes
SHA-256: 2b87a405324759565dcd16f806d3103977d8c0eec0a4c98aec3f68ab4bb219ba

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