Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1e753fac89a3dd…

MALICIOUS

PDF

88.9 KB Created: 2021-07-06 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ae57b30b13e568a2b87b6bbd535ae092 SHA-1: 048d3ae2a35067013eab9c550240d0fea28a4505 SHA-256: 6e1e753fac89a3dd35d5ec2a5b7c397edb19df4afa23d8632b047c1875da8944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=best+comedy+podcasts+2020 PDF link annotation
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/kijupawo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/20052846792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096adf492900---16405394541.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791e295709b---zadarikiputozol.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/aeb5bc9941d42be3bc30265549dcf164/82593441775.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6115fd7249---94903908837.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a160d157c1---kibepajulelerubujora.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0ac6e7dbfcecccba854e961560b9eb1/37802682541.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d5bdcc64---wituzakakepewowame.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/pufifupupi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a029e9b4300---30615532432.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a5aef21c---82369700026.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/63394712015.pdfIn PDF document text
    • https://istanajp2.com/contents//files/44964322541.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/tirobo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xakegos.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/pifebaxuwadobutofer.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160930c09bebbc---20742091094.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/falohbbjo9m8bff6l2cgbir96h/45101343311.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fedanadilovon.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9st2ofqu23jvlbbv71olt0g1n6/fafabediga.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/anidm5919b78r3oqsgq7k6ua24/13163337130.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/25cfcfc48e5c0f066a4d20514c4fa491/26073492706.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lp36h15atg4nrcichqfubq11d7/75177945761.pdfIn PDF document text
    • 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_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 17356 bytes
SHA-256: eb50c942c2495cefad20012e86b0d74164d04a61a0a28fdc6309035bfff8c931
font_01_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 10740 bytes
SHA-256: 38ff88146978bd3226e8b48988365cf01d343074cb7b92ae72254f2de3f25f40
font_02_sfnt_off00013eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1