Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0204bf6da70f369…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 17:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42543194a1ab6811ddc2fde73a86b29b SHA-1: 9fe8e5100576ad36a98f0130ddce592bbee6f921 SHA-256: b0204bf6da70f36956a33359b36894d5856e69ba4590cb321be58b5ad6471a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including a link farm hosted on a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/31e213752254cbd62af198e7de74d963/72637578280.pdf In PDF document text
    • https://burlingame.com/wysiwygfiles/file/galaji.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/donipuxip.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196141632.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210907212442.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kijaxomo.pdfIn PDF document text
    • https://network-italia.com/file/nenipoteditikapaxonexar.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/vinezes.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lazesivumexoviteze.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gemexozo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/40735510603.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/dejemanuzasodexofutan.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/68811553576.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/xidugo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337b5290f7---felozokuvorow.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149917910795---mosesegamejevezilimolofi.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/podejugegus.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/zetumulofanofalalan.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/31a4c6d8fb94b371d7adf51b4b406448/pefowireb.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zaxarilogelirarepuzumuvid.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/lutexidi.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/75184404495.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/97534492023.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jusenixadakan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ola+tv+for+windows+10PDF 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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10564 bytes
SHA-256: 8a6149c413168b5ca01fcc2bc13ab879d296a95f12893f6dae0002f617de0e0c
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 18068 bytes
SHA-256: 3e0ba4495f81c1c7279b79bec8b6bd4b5583213e5301de354aa50698add88469

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