Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a2beb5e00b5410…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 16:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2caadf795da634b71f7b6a82471c37fb SHA-1: 1c34e2ac81c1d6b73673e15d437bd531a68bf235 SHA-256: d3a2beb5e00b541055c8448d2418d34a571e5a1be2fe8afecc46425ea07c9258
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vanprodukt.cz/UserFiles/File/15753461438.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131399b88f13---25197029405.pdfIn PDF document text
    • https://polytex.de/sites/default/files/xinawoweretevadademiralu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/90377585027.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/xilimiguzujozarixogisez.pdfIn PDF document text
    • https://hiroyoung.com/data/files/kesujuvupekafelumifudud.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57220349521.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/14783337495.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sinazakabep.pdfIn PDF document text
    • https://seikai.jp/free_images/files/genoxufonupopazaxe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b78214fed---22976340790.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/19617423725.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dolupusesepefa.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/52464377145.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suledivanovaduzemetepe.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/87379031547.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/40386708086.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ls86nv68iv0jtu4an1h28bhi7n/23167332237.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe07b3c10---poxabuke.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/sevufutanipubojifivuju.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/53126953049.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/46338442567.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/30281183365.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/gedujomapo.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/67015985242.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/77661026127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wong%27s+essentials+of+pediatric+nursing+10th+edition+pdf+downloadPDF 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16896 bytes
SHA-256: be6797eb9f63ff94be282b8f2dc9bff1cae7a6adb1eea9d79fce9a27679abde4
font_02_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 11284 bytes
SHA-256: 91769bee4ab479794918392551ea82fb342b8cc4c8ec8fc65cf7c1695845c6ce