Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a46e78c3c56896…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 22:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79de4863d250f5f5bda8b475e1925999 SHA-1: 533c1768f2ea8749b450c88203edd9a2171600e6 SHA-256: 50a46e78c3c568964effd09fb38312f123c7cec34184bf7686fabebeff51392d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The primary attack pattern observed is the use of a link farm within the PDF to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://bioterapiazabiegi.pl/obrazy/file/dafuwikakuxam.pdf In PDF document text
    • https://beaszemin.com/files/94481982580.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/kexekerimexumanokararifu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4594f08f7---65169104320.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aed784f5c---kaladajudo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/navusajixi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5f24193e6d79b85810624dc5afcb21db/19063166629.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/71b3c6c887fb7a2677d2c400ec2934c4/86736480519.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8e2ea351---larugejuvinutenugaf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094555f5f0eb---rulalurejobigufigizetug.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5bf287d7011df0e46b50ccecfcbc37f0/nalajotirivafiki.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/gifobezid.pdfIn PDF document text
    • http://benetalent.com/upload/files/vagijonefejasotagowuwu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/34456566499.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/69211816802.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092386c612cf---60188697459.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dagaxir.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40ee00334---26827200195.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/joriworoxuwiwega.pdfIn PDF document text
    • http://merwepizza.com/upload/file/48595234007.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4a83bfe8d4d947f4bfe8929d11782bfc/36135528296.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r5s90bmajg1ciqkmgnnr0kjpnr/noletixuzotodexevik.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kexunoguseka.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/41145640646.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dipuxibepapotegozojudireg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=soap+carving+easyPDF 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_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 17076 bytes
SHA-256: 3b1f75eb3c959f88ecdc7b3d05ddf439066441003b4e3031b1e525c74a572676
font_01_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 10660 bytes
SHA-256: 3e04147daa012775b40e96215402545c1c0335023671550d43d55a422d8c9f86
font_02_sfnt_off000147ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1