Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed6b19a2335545c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 07:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06bbc8d29637b22ab079a3944a7c1b50 SHA-1: 6e7d6709046ff7088f27a2a7ffe189d6f970bcdb SHA-256: 7ed6b19a2335545cdb604a50cff911a32e3a26a5ca833215803da36c367fc216
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning model flagged it with high confidence. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content.

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 https://tomas-music.com/contents//files/51850631508.pdf In PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jikuwivuzowidugi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a5447dcf---52283915446.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210703083440.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/53406000118.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/luvaruja.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076d25894acb---dejodudi.pdfIn PDF document text
    • https://kristinanamaste.eu/files/dijivaxanufiketesuwo.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/kogoruwupadarojolovaso.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/16497180041.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e073bc5da---47451997211.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/cc160a00e13d194684ecbdf1565da6ff/jatim.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/ditatiwunafewatelofomow.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/58295594304.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/74321715937.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/nofetanap.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/suzetipafuxasonerima.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/6sen123r7jc4cof87jk32dm5hf/totanokukepibowaniwal.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/vemuvizura.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffdd8312c---gikudozuvolavuxilaf.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bulagadoga.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/47536651953.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160970d7ecf946---78143728791.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/pawuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spanish+words+with+zPDF 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_off0000c009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC009 10532 bytes
SHA-256: cf8a8a54850c4f95af55ac2fea1469e2f8e5601d4fddd1806050238f3e3d8997
font_01_sfnt_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 17372 bytes
SHA-256: 20f3f23954a4a382e1b1ff4b32aee04adde32e034123627b6eb518258a9cca23
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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