Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc3eccf93ab9071…

MALICIOUS

PDF

88.7 KB Created: 2021-09-15 15:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 062754273408f8ff2dbdcb42e6791d66 SHA-1: cd49f20bf9a3c5ebce280f24e083558e77f85a43 SHA-256: ffc3eccf93ab907178f03b35e9fa2c7bb6547b137132c78774c2a8b5b962f2ad
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of multiple links to compromised CMS upload storage suggests an attempt to distribute further malicious content or redirect users to phishing sites.

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014023c010---88533109152.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/42017121977.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398f9edb93a---62654063462.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/20863890635.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wetoruwiwevep.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/jepokikusibosamafubal.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbed2295ff---28876152870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110e50e942---tadiwugogubuvebapizaxona.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6416acf8---97865873789.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5a5a66cf1b8883433ae6d6d3b598f6ab/fogisut.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kufuxuxerupasulisil.pdfIn PDF document text
    • http://eichler-kammerer.de/8843082072.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinomoporabuwisagutev.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/loteje.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/vimuwemubiroronutubodik.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/27554827260.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/19804226614.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/73831226136.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/45bebd9e7d5f3559d3da36d2f0f6d80f/81037912438.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/5200856392.pdfIn PDF document text
    • http://rapet.hu/files/zaruwejaxubirubamakomozid.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2104f38e7c2c56b766b3f529934a6d6d/fuzuwataz.pdfIn PDF document text
    • http://freeski.hu/freeski/file/88086566060.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/056799126c60713cdba3f9afdaab12d7/80334262385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+excel+androidPDF 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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 16380 bytes
SHA-256: e47d0541d69657ce61b59a078570df83e2c854a392629ce7f6fb7e56179178c8
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 10176 bytes
SHA-256: e3497b19d79af91980fc377ed971cc0319bc0b60425c552ebec3ef32bf98f72b
font_02_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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