Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa0749659c23ce5…

MALICIOUS

PDF

107.2 KB Created: 2021-07-22 22:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cefa29fd5c6ae14cb427f861055e869a SHA-1: 627caed2921e99127b26bc1d500c8c9127b0ff37 SHA-256: 1fa0749659c23ce56af22902915e3a3727483d3d400d9d3c447677ebe628b894
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript and numerous links to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fdeb28e---11968433204.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944b4a6e433---20593136857.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/vojuxav.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d627d88b---65309969733.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609708b88f856---41505627494.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcj00r49f540ieuon3oo3ugkeu/rudiwukaruku.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vovomumefusinogukijerig.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803f77077ce---pivokafepuguwubip.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c4e90cfc931bf78231a7ddac4117230/lamadakugefimovebugu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a30156c9---gusagamujizifedifudisikag.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087836f8e809---76268133903.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085d88d43d66---nazasi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608497a2b8d89---97965009161.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52d155cf0---danud.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733d21a53dd---920433618.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/junasajuzumidazekamexi.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/78409847585.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/71551996751.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41221135791.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cd7816b1a2b42e436148de4b7b3ed1c0/sobapumebisatekesetibo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/n0u1f4ef53tuhni0beggijpea7/xaxigarorukowosofotudawe.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/61575982600.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b180499097dd456c1e03379d942b0831/jakimukavewabaxapavewutox.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/2031654398.pdfIn PDF document text
    • http://cichanski.com/Upload/file/tokavamidipewixisakepi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/83810337662.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e6d55133cb32a3414de0875015f6247d/diwaboranesalek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+many+times+does+the+cell+divide+in+meiosisPDF 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_off00013dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DD 10792 bytes
SHA-256: f1695fffec62fd0290b2448e31140f8fd6ceda047d03d32c5f7a9ca833087312
font_02_sfnt_off00016e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8F 17980 bytes
SHA-256: 888311d6cfbfad6353ad44ed3c639e2fdcc6c921d8cf1cda256a407908b3d8de