Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f4d71608e4f138…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 20:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74c01e439b5de57c3d3a3ceebfccdd08 SHA-1: 55ceb1af3893ec65d69481153cf8e52937118719 SHA-256: e6f4d71608e4f138314bf5be99743d8aa84fe873211cb86572418a925fa38085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=rania+siddiqui+novels+list+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132297933b77---61362507644.pdfIn PDF document text
    • http://zatacorp.com/upload/files/fuzediseropeg.pdfIn PDF document text
    • http://goref.ru/files/file/tukuvokevosi.pdfIn PDF document text
    • http://www.agot.pl/upload/file/70600748655.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/45p75ftghaafjhbav754ahi1l7/ledufod.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/52236246824.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fe80ca885bc1d935c1849a9fd2d49e7b/tokowu.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/40162510201.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/52438381891.pdfIn PDF document text
    • https://aneri12.eu/res/file/fuwumu.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12893684595.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07108e81f---59618467429.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/domevorigaxevol.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6331b97be94e0aef3e494d8ae8bd45a1/11738994213.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/43lb1plgaulnb2hk562utrkcc2/72890641533.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/31808582285.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/93944696267.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/5993269045.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/29145188690.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/61402382125.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dqlp0fsf7joilcuqqjgd3idsqf/lisibuxafitosukalif.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/9439160306.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/77789562061.pdfIn PDF document text
    • 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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 10748 bytes
SHA-256: 318fc80ef6417bdef8f30996a0bd72c5842d5987a9b6d314bd46dc768c292ba8
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 17748 bytes
SHA-256: 401910a081320ceab0a07235361dd81de6a26dd5436d14a0dfbe9265cc770daf

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