Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7138c309aa03ed9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 18:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b43f8d5f29083ae8b483e840333da70 SHA-1: e75f6e9a714d915330d41d7eafbc42f9f29a4356 SHA-256: e7138c309aa03ed9adfcbb1fb9ce728b78d513f4272c2659011ad5bc89279a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress sites, with multiple URLs pointing to PDF files. The PDF itself appears to be obfuscated and contains embedded URIs, suggesting it is intended to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f1e81c76---gularudelexi.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/lumip.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/mepurafesivin.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/86027750833.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/bofiko.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/budixe.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/72186129225.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/88514026033.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/459ac3a106ad2d8a8c2a707b65679200/86589398116.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/78707880825.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/safitorunajodurunegadi.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/8736707254.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/70461516371.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/vovumusogepogiganekimowej.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/voxeduxobujez.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/nimupulopuneluruwasos.pdfIn PDF document text
    • http://carbonelite.ru/file/8655161508.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357e35d31d2---96148552542.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613711fb4440d---majoge.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/33065125799.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff58db500---xagipefubesofosonok.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/21037322600.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/javupujumevi.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/kefuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+phone+sexPDF 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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10264 bytes
SHA-256: 68bd7dbfa079478421585975a870dcb2dc2deb4b6c193c88924b2cdf7b5de8b4
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784

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