Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7624df62a39ff00…

MALICIOUS

PDF

93.2 KB Created: 2021-09-07 10:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d331ff41b08441f77c70aa69937fbbd SHA-1: ff4cc90d89a64275b1c2efde1eb70eef07d3b3b8 SHA-256: f7624df62a39ff0030a61b85f41e8f1bcdc2e557729e7227c04add60a4e76345
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/65443681461.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/ruzozetalake.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jitubotipatavadewis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01001f15f---solefefonuv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8c53f3bfbe4cc22d951d8e743f6a530/95914460821.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/gitimofafop.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429732ba3---pusowiwanibefimakapemenex.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/mimofegaduzi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd2e806f5---40863765094.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/82409809822.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/lagezexas.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/4009444160.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebc4663eb---beropatitopumevuwifoj.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/zebutuj.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/safidikonobujuzozizogak.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e8bb42ee---82973665231.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/55178342284.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/livatevumakojovivogiwa.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/35394455296.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf653a36d---2603377835.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e48f6182f---33118343495.pdfIn PDF document text
    • https://orangerun.re/photo/files/kubiwul.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/74841513666.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/fagagijizapofirodi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tsmb06cujq03n5ju77u7fng991/75000740911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=medidas+de+tendencia+central+y+variabilidad+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_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 10808 bytes
SHA-256: 00fb610c3fe44158bea30df78a2aab53b69c201ec4cdc426e7dd5dc80ed8ccbb
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 19964 bytes
SHA-256: adfcdc698ba02063754750652e65289763aed2a6e21ad3996da5207bc76a4d09