Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d3c72bdc5cf8d…

MALICIOUS

PDF

81.8 KB Created: 2021-08-31 16:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 977ab5dbc79993413b48b98c1c0a6e8c SHA-1: b5b7da77415b62571253dc2341e6a7e436acd07e SHA-256: 5b2d3c72bdc5cf8d12388b9d16db95687be39e9f8b9a72c102cefcc8d6d80dfb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external content, likely for further exploitation or phishing. No scripts were extracted, but the PDF's nature as a link farm is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19156ab4---56876833015.pdf In PDF document text
    • https://promaxsuspension.com/csmimage/file/46998982163.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/27063313925.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/tamikinegesutomeraj.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429005310758064.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/71865777738.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2uaiidsq1h6eoovc2b81m8eq6h/gowivepobokipufu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jokokijaxivotaguximup.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/31101951035.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2679caa3307a798b1eec47691cb0cf5e/68317720218.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/povorugapidotijalixizebal.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae3104fbf---goneroxizale.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160785bf1260d3---28207341387.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nigonerikev.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f5b5830424285aaadf697bb8d11866fc/50639452410.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e03e053a---24226277191.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/39718528148.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/9635574219.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089b53f33cd9---54823872325.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/99622687310.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/735e864dbf8a973b20b889d4688311f8/vozuwopesenevidadej.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/82124264875.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160866c1a4d29f---mebowinoxe.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d60ef3ccdba42ccf380ebfabbcf0cdcc/44592501746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=addressing+modes+of+8086+microprocessor+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://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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 17644 bytes
SHA-256: d66c05b89dca91f334f5b9ec78fb1f5fe99dd22eb6b45ddea8d562d32b2d3bbe
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 11136 bytes
SHA-256: 3e49dfa8c3bf568fc2a5644f50895b27ac50e2206f4ff4ff4b57b4ad3d588493
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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