Malicious PDF — malware analysis report

Static analysis result for SHA-256 2265c381a17e15a7…

MALICIOUS

PDF

83.3 KB Created: 2021-08-24 15:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 39d6ef2f577857dd9649279342e1818e SHA-1: 96a5c99fc1c4828c82dee448d468ca9fd66988cd SHA-256: 2265c381a17e15a70c94dd20c982569b1e38b448df12a83634accabfb3045510
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress instances or disposable hosting. The presence of embedded URLs and the structure of the document suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=carly+simon+like+a+river+lyrics+meaning PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd3c2392c---wixuxu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/dawaziligiwen.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eo11g0c0ugu4pdkdjotdtg3e31/nemasejolutazojuwufid.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/nisipukijizazewobo.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7l9fb16003bgg5r3uqd6j9v699/1730876661.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/922765356.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/61120182046.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///51007407019.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe16c754---9594373866.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gsde53e5p3vo86ul4flcvcnih1/93806882904.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/walatemav.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/40430b527b47c0865191d346d90d4a78/36612137560.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/fidabimidizov.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wugejot.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/69993687202.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/96160256956.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zesogunafibavasuxela.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kimunizekelawuvo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rrk53s31e4jnmhokjbigd7vo1o/vesaletapadinikaj.pdfIn PDF document text
    • https://t2sc.me/userfiles/vekunowevu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c88baa14eff---sagobamozivonip.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/73be9b8bde23d9a04d592eff9d0a4836/70106546899.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/66705322241.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/jokemewozavojoriwiwitumu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/funiwu.pdfPDF link annotation
    • https://ajitcoatings.com/uploads/57170080400.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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 18440 bytes
SHA-256: 0194ebabcbfb6c575a23ee6ac3d90ef1cb72c22d5cdda98061f6bf53d4d927b7
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10776 bytes
SHA-256: 2074bbc2a14baf234613d8fcd08c99108307bebe6deeebb92aeefa1f80d51542
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1