Malicious PDF — malware analysis report

Static analysis result for SHA-256 d109f41b3bea13d6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 11:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fc33826edefaef42f01c09ecc005a04 SHA-1: b586ad55f55ff321e4896749ab10a2b975e17130 SHA-256: d109f41b3bea13d63924431fad57dfda9bb3c13d88e27a50b098445ecc958324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious or phishing sites, aligning with the characteristics of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://volareinmongolfiera.it/userfiles/files/bububakele.pdf In PDF document text
    • http://ijfbn.com/editor_up/ruvezesopeboxunomulewa.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/62284439558.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/97088390461.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/64672358364.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/22e0fa619808ab09521984ba5862b205/75104678241.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/35093350552.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/1793127759.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/48452855898.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/796f6e931408565b94ed2360f3b8226d/vafelojutavumoma.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/tamigupo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7d88e6b6---zubuno.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wuvosulok.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/32328834021.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/lexafenetewixafav.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/monosumenopemoju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614207e2f069d---40464139590.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/79685793452.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/lomax.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/juvewomafimaminatoteg.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3ccee8c17b1dfd492a8b15d25a4ec48a/mavap.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/xibutudegezoxixuxebadifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=class+10+chemical+reactions+and+equations+worksheetPDF 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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 19460 bytes
SHA-256: cb0fec8462f289dd74c50c104c4f2f9d67f83bd6c7385e0273d946fddae4f535
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 11264 bytes
SHA-256: 84b10fc61c77615afb52e6b47f5801dc852bf402bf77429dd3c37fbfdc64cadb