Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1eb1ffe34bdbe…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abccad4e3dec280beab1de964ce82e1e SHA-1: d9080b34a325633ae71f97df1eaa09617befcb4f SHA-256: e9f1eb1ffe34bdbeea1382d4591779a2bd91b90748330b449271de65238c9acc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, forming a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rubyyadav.com/nbloom/fckuploads/file/12625629542.pdf In PDF document text
    • https://menu2uplus.com/images/file/posigavegu.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/jitisivozovabezositen.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/69753659570.pdfIn PDF document text
    • http://zimmerei-possert.at/48924891660.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/3370574680.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/68892667610.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/dukole.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d8818b0d21f4dd1fbdbef966e79341e9/92782118015.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/falujinopipomid.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/13816180475.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b4a111cde451d5715dad4654db4872c5/nuxedipumakoxinopo.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fagufazonibabomutakaperoj.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/xifone.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161364617607a7---4242870173.pdfIn PDF document text
    • http://dhf-china.com/d/files/25383504012.pdfIn PDF document text
    • http://kalikraft.com/images/file/65664131097.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/devipabajilenamafizakikup.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/60741305756.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/86324623423.pdfIn PDF document text
    • https://jensbrode.de/files/file/38199923483.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/45592571303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fifty+shades+darker+full+movie+watch+online+filmywapPDF 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 16520 bytes
SHA-256: 665c9668ce5df965bf573f54ec47144cfa41143c55f30f7a9cc53106299cdecb
font_02_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 11320 bytes
SHA-256: d4f60900f47a832df30b26a83e4b754bb2ea5870a918d4b53bf5d95e16e36bae