Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c197ed6597b573…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 22:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fc21fc217597b6c5fa5efcbf39977739 SHA-1: 1b06e35726d20401172650851277c449dbcf2b62 SHA-256: d3c197ed6597b5737269baf04ec4a9456eacc2de281e64dfb2166df7f72d8554
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The presence of these links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00397c550---wawowunuxuxep.pdf In PDF document text
    • http://halmar.info/userfiles/file/58855285542.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe4188e60---zuturonusam.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c42ab71fb---40039291756.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5ecfv0nrh1g2vchun539qq1rq9/10512674764.pdfIn PDF document text
    • https://laser123.com/geektic/files/gubiwazafetegemevol.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/46248415892.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cf1854b1---zixuxopununorenukoruwaka.pdfIn PDF document text
    • http://yejida.com/userfiles/file/bivelilevuwamisakug.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/tagemugukoxedukili.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/72545814578.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/566h7jv447njf1uierced9pc4d/fonakavifudafolapopukuz.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/6451605792.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/drcice793k8e9r09ofa2r1s2gu/gaxoxabewabepesab.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/24423147959.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986b1b3e849---xaguwi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64c60511c---30411411613.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/868cef76fc994299c01a262ef1eae8e4/nisimumisisizanef.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077772981b8d---lugirepagasubitikuzim.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505181032808674.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/moin4iuvqtcll6di7gdd7jh41j/zodifosedabititudepoxuv.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4764345ba---27689591489.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/638906424.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f5033054---84819446063.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63ea25ab3---88391569192.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/besolezikawipoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=political+effects+of+population+growthPDF 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_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10944 bytes
SHA-256: b395cf760466218039e4c6eab5cc15c960adf31053ea839380a781a737f75942
font_01_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 17772 bytes
SHA-256: 1bf0796a24bc1cfe5654214dccbcd68352e4b4c05469e217fc1c8f5f76ce7b37
font_02_sfnt_off00014f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1