Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcfc9a87d55e4ce…

MALICIOUS

PDF

88.8 KB Created: 2021-08-08 14:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb80186ff12fd186b5aeaac5593d3186 SHA-1: 0daffea34c09990f8a46a7d54052a84cdae98a03 SHA-256: 7dcfc9a87d55e4ce7ac5edd7137badc12fcbe293f052d3afd6c44795941784fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.siposferenc.hu/html/76044052541.pdf In PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///78961991808.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/mabulibemorimi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/gupelasonivewof.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vepifutepojujejaledofeb.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/magud.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f641bdc---narukukeniwolotova.pdfIn PDF document text
    • http://qca.ch/userfiles/file/sokumisuvejimiwikuje.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/57113987102.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ioa3of4s2qjlk8rrhk8h54jn12/tusozepelorukofavubogi.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/60112766027.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3632f3c30c28e53ac8542ab3ea81fafb/29722906744.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/27374269347.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5d183c2781155c6473f34adf86189d34/juvumaresajinobajejapu.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/jekeji.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fa74c38739cfc875e70490265ecf9d78/bepidin.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/7862924911.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/soged.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/snbond79s067fkhfet5nhha043/22697959669.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nimowi.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/37625399959.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9bb4cab1---88504559968.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/60772685166.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/fosepat.pdfIn PDF document text
    • https://csn-alliance.com/data/files/purekonevisoboriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+does+wham+bam+thankyou+ma%27am+meanPDF 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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17880 bytes
SHA-256: dac78e253df30a9e3141666f3ede651f5489013442575a1ea98128723835e1dd
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 10836 bytes
SHA-256: 412ce9486cdf53ca548ac9e49433bff55eb9e95ee49ed158e1040623711d5fbd
font_02_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1