Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c55d045fb66189…

MALICIOUS

PDF

107.7 KB Created: 2021-06-28 06:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58b48e6d6265110c752cb626ae4408d8 SHA-1: c0bb9ed73a2a289f58ada35ba4ba944b94e16ae1 SHA-256: 71c55d045fb661898803199b42d08e74c23b05f0e39e41cd556f7f3637d4e87d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://aarogyamedico.com/userfiles/file/sugakux.pdf In PDF document text
    • http://say-international.eu/userfiles/file/89103440272.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/678f172e3ee71e249ccdf8d7d9eea1a7/5218351502.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/79615958324.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/60uesnjbtc5mva1s69u6cj7kt5/70092172109.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skf4dmj2972toplphoaf06nn7t/94727794587.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/627db001f53a538177e1d1a5b15f953d/wesabidipozegimisujiz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b1638ee7---lizexuloluvusapuj.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/150523275107.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/82213312638.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d8692bb66d2f325a1a99b85cfb318b3/38972874396.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/73220521062.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xuwazalepufawisizuf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d6d237f3---lobokowamuxubenususi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/depavawesu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4b602a2a---lugetezirufanufepi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vhvlbpcoq9hrk689533j8qa806/36354768086.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61613329186.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/289ujsol236ks458d1g2lubvso/towarifajosonomibifubu.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/43999760070.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/fiponoxorefulixudujenukak.pdfIn PDF document text
    • http://atek-ent.com/upload/file/9149597415.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7485149d8---17492472614.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31c76e6b09---jetub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rice+water+on+face+before+and+afterPDF 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_off00014326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B38 17032 bytes
SHA-256: 0c9cd78d7156068b461f8ceedb3eaa014224ceb0a65282d721aced62ae01487d
font_02_sfnt_off0001878e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878E 10524 bytes
SHA-256: 198dcada62fb2a04a3fa6b21588cfec987d3c52ac8e77cbb6c0790778f70f0a1