Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d62444023abaedf…

MALICIOUS

PDF

76.2 KB Created: 2021-08-15 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c4a8d8fc6844f711af05677fc09c2f99 SHA-1: f01fdcafcad2c1120c3a9ce8c3d4ec1cd35d3d4e SHA-256: 7d62444023abaedf90af7213f1832b79be57c490be9d440725f5b270d850edbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bc4dbaca47c8e2e23ad46c4c2d007eb4/96542191008.pdf In PDF document text
    • https://purmoradiatoriai.lt/images/files/fexanipoveluseratokebe.pdfIn PDF document text
    • https://kawanmto.info/contents//files/kozidagulanibuguvinez.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/27255309111.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xipasalowuxogez.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/zibemosobatiw.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/tevugowilikir.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/983eb802936620559f4c84650482fe32/37453073463.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/66634681320.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/27955415745.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zumoz.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/58001774228.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tirifosarijowumu.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/foluvitokexisawotoxag.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/11918085822.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160922029815f8---sapoloziwupudugazo.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/r356maa387tcecsi07f8dj5998/81189966155.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/lufogiva.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/tobogodizogebuviludelexiv.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/jafaworoladetige.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/vaduvudokudidifasara.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dositixuf.pdfIn PDF document text
    • http://mobitransjogja.com/files/xefalikugevivilepitowivob.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bfffe286a---87790550947.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/puresoxoraritokesale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+program+a+radio+shack+pro+82+scannerPDF 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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 11412 bytes
SHA-256: 921ed09155d164abe4bc4fcf8162656c194967abef388bea5447d29fe6d38135
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17668 bytes
SHA-256: c916de72b7ee3c49882cad2af1c52e2f8781a3d1b85e15706d35b001b0110050