Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde472feafcc046…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 06:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4775d874aa8db7dff9e2474dd95b067c SHA-1: 06c84fe1d5f0dcc4062bde9f991848a467a2ce6c SHA-256: 1fde472feafcc04672713cae1bdf4a03fed6abd925776707725c46f9f4949274
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of a link farm on disposable hosting and compromised CMS uploads suggests a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf41983949---66912319300.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/21272263321.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/0ffa21a8c1b1add26969c0cfde261e5d/86126333389.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64c01874---vatusotabuxozofutusewesi.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/17326453260.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/68147073573.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133b715147---tudokenutaweza.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/12505408649.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/tadinonirogozedote.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/pedewo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6284f0d5e---jinise.pdfIn PDF document text
    • https://mszukam.pl/dat//file/80173822885.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d30a01c9---potaxupetuzololadugu.pdfIn PDF document text
    • http://z500.si/files/24959356119.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1181c32137651830e28ad8acb8fb0497/46716476803.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ad59ef46---rixigolugovinatugedakabol.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/27847701669.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/51709799687.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/39684724038.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/tebotin.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/zapumolemegamalokekom.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa7a31ac8---63221512805.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/gixelu.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/sobupixed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=san+antonio+airport+map+pdfPDF 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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 17796 bytes
SHA-256: e5dff2fea5a88ee2a60568e034a3137ac60178b99e266bbd4fa7b607b3f61a6c
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 10388 bytes
SHA-256: 4a5d4b8f953017255f1a3ef663ffd942b8b689af9ea465017afa5a6cc182e511