Malicious PDF — malware analysis report

Static analysis result for SHA-256 117604f0451adb36…

MALICIOUS

PDF

140.2 KB Created: 2021-06-12 22:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f0da899b5883e044f659100813ea296e SHA-1: 985eae71eb83bc0f1605de102c367dd866710c26 SHA-256: 117604f0451adb36bfdad0a484a074e0588aeaabb72c85ef173b8e446efdd6b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=twilight+breaking+dawn+part+2+tamil+dubbed PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081743891629---suvaxuvuruzag.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f1a4502ac---4780323036.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6acb041---28099232495.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/49ceb327da3f599f0d66cdbe04fa6b5c/kolonekomi.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ucdlnij8ql8dg09rta6qu7mcl3/46808325020.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/73773c59ab26447a28ff5a2bee2e974e/gekawonemu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/49d7f4eff95e2d1ded1b4e8804968321/xusatajenuwi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa1ebd02---binekarumazi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jfufnbodsfb3ubtrfq9mdnkjdr/20066308828.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db50025351---96165556352.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/jufiguvada.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b20649dff---91941071826.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/filamo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lowukotubix.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ug18f6rmjvju25kobnupgf10do/69926687468.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a07439d1033---tazejawerudumo.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001dc01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DC01 11476 bytes
SHA-256: 5cfde06c7baca132869d311bcc2ef0da2c4b946b0009ca0fd3ae8bf65048cedb
font_00_sfnt_off0001c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C933 5572 bytes
SHA-256: 9377844ca66a6c6ec23499c5873b1b5d357f23223e054e96725f960be90dad56
font_02_sfnt_off0001f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F94D 12564 bytes
SHA-256: 3e7bc236e0fab2da62048ff2c2b6e4b97d41c8a460eb0df3b92bac239b9c4c04