Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb66d0d287ec8eb7…

MALICIOUS

PDF

104.0 KB Created: 2021-07-22 13:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f96db48106252a224800eced5e9bfe7 SHA-1: 5f6ca20e91b17c93053e276bccd1e76961d9ca20 SHA-256: fb66d0d287ec8eb72aa21c0ca3280455f909645161969e524a18e7bd7b8603f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://kingsfinancialconsulting.com/userfiles/file/39243065173.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f511bdeeb81---vefiwewevudiji.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/wexuzaxodikimopivumemig.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/74153179672.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b04723c6f2464aa404faf78f80b8359b/begudenugafofedufifa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325af30fa5---venim.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/jebefebibelefezikawotul.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/aed65d07b5f9416a2d7bfc3be0e2b1da/jokavegidis.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6c2e2227---mimifixipedeguziwevef.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c750ce3e790---zanalomakudufivi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b784a4d32e9---96357753905.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i0s8s6e6v2an3k8plubnr9cad5/15816114137.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/431feba9bb7a1a3ba2775119e5816835/7215563254.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p3q4qak38dj5nqk85j5583sjlq/80041162807.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/larativadolesora.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/nudelijifamejek.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/salabelumomufutexozomapa.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/dukusipevovuladigubuta.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/34303404332.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/5740676191.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/64302960185.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526152609.pdfIn PDF document text
    • http://ncsccalgary.com/userfiles/files/patanegavedebawaxefexiv.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a953887cd5---63470406926.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qt17t36tm0629hmcoked6jpftg/9823547180.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cd149885---zefarizupijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+determine+how+many+roots+a+polynomial+hasPDF 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_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 18712 bytes
SHA-256: 76ebedc7045b373501b94266f4f385574497b44c5f46979e32b80c06b03e4b4a
font_01_sfnt_off000160f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F0 10848 bytes
SHA-256: fd5d025297b1a4631d54dfd67ba201e3133a7e87759d12c1ae400d605a3f2a4d
font_02_sfnt_off000179c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1