Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3465c5d90ef7ba1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 16:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff066e8f5238dae6efd3e35df0375feb SHA-1: d8adbdf1acf9c7720eada0e8688f7fc4bc0d8135 SHA-256: e3465c5d90ef7ba1265d1cf906aa81f27036ff16b230db7d3e3ccaf4140f4f49
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c5c80f24---fajetopakovaf.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/famesikukaxudogixapit.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcc3c8c42d921003a93ae37f0f69e2df/83829156822.pdfIn PDF document text
    • http://jaatkinson.com/userimages/27825507355.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/41652003684.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607981ef73bfe---misefogaru.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/880e894d2aebe0c9fe071d795c1eb976/76084220439.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/56395249963.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a434d0d3c0---15236730734.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd27754c0---nopumutugorapatit.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/67686165918.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sujegadojeref.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/bovikorulolizegetulomew.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/567ecce3f484d35c1bc680da074bb13b/lebepufirezuponunijur.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mqkqhjddo4lteula9e4mpht99b/23559545794.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/41404944123.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02eaf056b---gipusez.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/75595773129.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a9d7a835---sepuxi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0f910516790c4ef805f8fa75df1fc397/lonodabafasabazewaji.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210626155738722313953.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608610e8933e0---32875339586.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceb2ac90e---93772037441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shout+praises+to+the+lordPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 17600 bytes
SHA-256: 2310536e600171ccd31ae94d947ca926f44b12340f6dc1db39b42f0734fa53cd
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 10560 bytes
SHA-256: 0552a3c13acfa9306de6f045ba61444b1eb73c5e5816aebd2b157991658f69fb