Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad3525e89aef2db…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 10:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e80486bad8fb9f0e6fb6bca6db4ccf81 SHA-1: 6f2530859a09a0524590c6896cb7bec7f3c169cf SHA-256: 7ad3525e89aef2db42ade0cc18fefb1a7aaddcc1c355bf0c9b31676cb3a92ce8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://cructi.ru/uplcv?utm_term=best+video+editor+no+watermark+android PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9437b274e---vemisuzenemenad.pdfIn PDF document text
    • https://digiconelectronics.com/media/gevizudubiserazufumag.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/63504961322.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/mipugovoxitikoti.pdfIn PDF document text
    • https://kratky.eu/files/file/55185416212.pdfIn PDF document text
    • https://kaimano.it/file/foninerataxek.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zabizawuxojunasogokebive.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/77355705520.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fumagofowemeji.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dinipowoxepoju.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/46797548968.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zozipinabisudobem.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3195557416.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/12713678724.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415018b41ac---35319278180.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/57288652850.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/85385582787.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16141764f047db---duvotuzataromowes.pdfIn PDF document text
    • https://ags-car.com/upload/files/mejutenidami.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/batibuxaviwofemilavazivud.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/52492768862.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/getitobesolosefanubofa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410fbc0d713---voxokujoxilavuwodijojaj.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gosadivaj.pdfIn PDF document text
    • 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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 10660 bytes
SHA-256: df1f137d29a4efa3812bd95942ffd458b51855276345482730b47d5234cd20e6
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 17784 bytes
SHA-256: 4a91b0a52011252a37c65831ae1a0735db39d2f24cbf3b642b63ded97586d2e2

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