Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf70683246d46fed…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 14:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 744c0356c1c2747e658c089eaefad7d2 SHA-1: 6fe928e3f5fd70cf44c56cb1afc8e1a80496ef38 SHA-256: bf70683246d46fedda8dc9b9349a8794ff1bd5dab7fa962974d189e0f59172d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gymostrov.org/gymostrov/userfiles/file/titojimovujamog.pdf In PDF document text
    • https://panificioilcavaliere.it/userfiles/files/17891178214.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/defupezewepu.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/xikudamoponezetonugiruj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/2076341590.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xodefopebarazirosoxox.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/64653862665.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/95842280866.pdfIn PDF document text
    • https://energooptima.hu/upload/File/lexavipepegutab.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/53950185667.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f98c7e2f039---wilerawirokiluba.pdfIn PDF document text
    • http://sbcnepal.com/images/file/33430294092.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/348d96da6bed6cb7567e5ec275573bcb/rojewasalazefejupigusasu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0922555f0d---solujisux.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/zufomeguxasasugan.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612012d981a8f---zijuvimasudevub.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cf487dc9---71183752169.pdfIn PDF document text
    • https://4appsoftware.it/file/rekovafibanutoligonanagu.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/42986989033.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/98452305764.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ad1bbbdf0f---59160906794.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b370d9f1622---49565275048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=juicing+recipe+book+pdfPDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10644 bytes
SHA-256: 6a9514ab8f5d90026d9ddf57118f8f2ef0571cc5a2aacda00fbd4348fc9a6981
font_02_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 18628 bytes
SHA-256: 5b1887bec7b93fd6baf9b7a20f46916b12e3f8673e7e35ee654801e3ad71441b

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