Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d08ec84ebfdf1b…

MALICIOUS

PDF

83.3 KB Created: 2021-07-15 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79430cba9c4a3d95c9a4a815fbb01051 SHA-1: 257910dd6769864d8253e90c8d0da67e79dbb8b9 SHA-256: 59d08ec84ebfdf1be8127e9975dee7746e3e05a3720be580ad198d2885b5c1d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users through a seemingly innocuous document to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://ampletrekking.com/userfiles/file/12339035345.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/vizefetubusuxi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f24531fa---navokexijo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092b28693308---61050373501.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/708b433b0c89ffb7a71e57e19af0461d/notuwufedow.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f605328b0c2d6794ef06d2338f9e5de4/zotopikosabalupimonuke.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/fazisexebugamas.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/35283115997.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kifezodidijunelu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3cfd239cd8f17dcd16664093d0e55e9/73183101445.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zafamuxanulidirejisutapek.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/93447699507.pdfIn PDF document text
    • https://avenue102.com/uploads/file/22152732504.pdfIn PDF document text
    • http://chinalabware.es/d/files/85000501509.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/399dc8c5976a6f486ec86145384d87f7/rojebusugiridejibibuxor.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hnbh3erceo8nfr7p5eb26prp33/gajuwakanozofabekotug.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/88262144081.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4ba6f00ec400dd4d9a39734b9fe20d0/95540246274.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85aadcff0a---davujam.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607950de13a88---66813054766.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/kinokusi.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kawuwidizeje.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/43975386345.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/zosiwusivubuloxazanew.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/bogumulazogelaxebafened.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/palos.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4334a0e46---5294243765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quick+guide+to+manual+photographyPDF 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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 11160 bytes
SHA-256: c418c57dc6dc2b589e1279c8f46d6065770eff2dc3da5943e0c13673ae3d6eb3
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 17076 bytes
SHA-256: 02d84e90869672d0ab6b1c36fbc78377ebaf0c5ad9b3d9a0e0f2f5b93d37038c
font_02_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1