Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03548ea52098554…

MALICIOUS

PDF

107.0 KB Created: 2021-07-30 19:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3450b5e2006b6b347844d52480af7d16 SHA-1: 54f565a756915baa51730491917b5c4cd954f741 SHA-256: f03548ea520985544beec718d8d8b467f3fbcb1a174f1dab88bb0c3748cb1828
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://medvor.ru/uplcv?utm_term=hotpoint+clothes+dryer+manual PDF link annotation
    • http://www.zywawiara.pl/pliki/73640807926.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ae32092bb3185392e8d07e54de7beba7/gefavufof.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022347577779.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9790c9b967---befitu.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/87485385583.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/pejel.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/585af9c8ccc71239ac767431764e9a01/laraf.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/2485965031.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/87807337300.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d464da80af1---vekakivivujeretowamexador.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/52320804173.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbb28d13e---tinutulozapamebivupasofux.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/77600e685de4692545fc17e564cf6f17/jedebuketezopatujosijuli.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/72775479446.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da8859cbe---luxuxixumunujitujiwisu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67647468212.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vuzokixomafebomajewimemo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8006d605a---12510308427.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/rusen.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/om53ovi3gff5ga1qsvf5rr3htr/retovogasizofi.pdfIn PDF document text
    • http://irths.com/upload_files/files/36826624910.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/7923964376.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1e987dd1b012b06ce6f58df7ccef5dd2/55486261539.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/vojulisijuxagaz.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/47331032751.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/31810418810.pdfIn PDF document text
    • 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_off00013e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15682 10984 bytes
SHA-256: a52899f009a06ca3cd78abe526ddf493eabf3bb8db5a34b915057b7140ead31c
font_02_sfnt_off00016fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD0 17508 bytes
SHA-256: fdab28561c5874f643c70b48af4f6da307617fe750ba97eecaaec6b45b12caae

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