Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20bec69041b406d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7607d1d612ad4686c7de5d69eaa2f5f4 SHA-1: 59a7161cfaec2213fbb941783e7f7f3857217817 SHA-256: f20bec69041b406d3ad3d4f429e2c3a0586db366eb759d266d3594bf3bd0e209
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://studiotravenzolo.it/userfiles/files/89291293789.pdf In PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/49665898901.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/tuvoruxubolib.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/10979700674.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/29863374251.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/53543992888.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4e62b483---3997769436.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/34733922537.pdfIn PDF document text
    • https://primer-spb.ru/files/files/88490681402.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/jerabidowez.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/gidisebojituramufepe.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/49682023962.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/73438725450.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/33730187163.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26ee5f39d---30126148112.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/masanax.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/nujotetopovepabuk.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f4b49b2fd6f48c1d9dc11e3504ff2fd2/84235165688.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/fewazirawamakepewov.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bd7591d7916a0cc9f7bdc7e639a6229a/xuxovabi.pdfIn PDF document text
    • http://zenithmetals.com/files/ginuninufesunexiturilagis.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad2e10f51---tafimetoli.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e6cc7e4b---99300358529.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kinavokaxoperexukaseluto.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/raxomoten.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d9c2e436---56674815720.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9bdeea6565c445fff041447b8a17b12a/67753664264.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093174755b0f---jabakipegububuziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=workshop+technology+waj+chapman+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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 17856 bytes
SHA-256: 8ccdbcd8d0634f05811bd7b3eeebf637cf2aaebe1f261c20c6268a3efc009511
font_02_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 11392 bytes
SHA-256: 9edc2c50fa6015ac4b43df46e8c3198ea1a8cd8ba060e0a6187a247e37e621a6

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