Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec57a885fcff225…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 09:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6376bce6128b3514c36c6d240e50d03 SHA-1: e6bc7fe2904651ff3a0c62473490961ca26b1d95 SHA-256: cec57a885fcff225ad1829e769b7c63a5275e8d9476376780074ada134da85da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queensflower.nl/clientfiles/sonewutufum.pdf In PDF document text
    • http://clingac.es/d/files/dalogidotolekukuf.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/15807718747.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/62342777066.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/kinalalelolakis.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/72355171004.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/9331942218.pdfIn PDF document text
    • http://podarox.ru/public/files/16855981201.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/gawafekifoz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2fa8a890b86caf80ab08287b24a5acbb/desegobizimux.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/4528020751.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/11759116232.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614575e247922---20780734717.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/76853234898.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zimen.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/91960723221.pdfIn PDF document text
    • http://gyliver.ru/files/files/wetamijerabenu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/43111224719.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b722cc62e7---21931995704.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108312314064515.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/73945091435.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/19073317095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=outlook+email+app+for+androidPDF 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_off0000ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 10708 bytes
SHA-256: ac5c4da8e2a6f270b86abebe64df2fdd3a3483b4d48a66c84273d70650413c60
font_01_sfnt_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16788 bytes
SHA-256: 1d824833c3be8670cd2abbbc934470393afe3f816a35bc732ed2d86b7887397b
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1