Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b23bd52ad870e5…

MALICIOUS

PDF

148.4 KB Created: 2021-06-23 16:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 33307c69b5b114aa5ba115339f98b59a SHA-1: 43c9e14ada757ba65d74d23b2c4dffb309da1397 SHA-256: 20b23bd52ad870e5691a59257c2c1eab288a6121b5df55a8e4bee679d812ece5
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 0.9987

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 http://maasmartcity.com/userfiles/file/98957372949.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e3c0da11---42715248295.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/tibogixid.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92d51d2c6---pudezugavili.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f020e15593---penozesusebumokase.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/asrlemupqbaa526bug0n2blc34/64567496248.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65322542159.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/83699299726.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79932416330.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/8922360979.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1dk1j1bso6m4thhq4ee8jpses7/zununelafaxovalikemug.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c24a422e470e43b4c07aff9ee23eb1d7/99090997722.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/71517317273.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5097297735.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/85487583815.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6f0e27fa0---89464608851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ki+rajanarayanan+stories+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE83 5152 bytes
SHA-256: ee29eb5c3986eaaa3727966d4a87c3e0497008559127f86d510bbfc2c805a9f3
font_01_sfnt_off0002002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2002B 4284 bytes
SHA-256: 96c7cbd44a422af21331d77b2fb13c5e5d505b572cd8ef24252c5459260287e2
font_02_sfnt_off00020fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FE5 3312 bytes
SHA-256: 80236e912e1f63dca0c28bc4227901eeb6483539f967d2db50363ba312a983ee
font_03_sfnt_off00021d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D45 11536 bytes
SHA-256: 4cb8ebe411727170d6a6d8576b326b6322592553ca28b228f0f4e3fedcdca930