Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0c621af5fbd7e3…

MALICIOUS

PDF

93.0 KB Created: 2021-08-08 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1207f7e0bd0a456de0e4c73532ccf04 SHA-1: f7266c7077585fe27d126679fc3bde526ce3f325 SHA-256: 6c0c621af5fbd7e3bc39373ea625b0ea220347a1f3b51bcc8c9f26ed7d3f934a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://abwhopewell.com/uploads/files/badusikerilu.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2n6lu3acn8jvktmauhjgophsq0/nifubopi.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/35424955227.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/19721300817.pdfIn PDF document text
    • http://proxima-design.cz/files/file/tusopurorixibe.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jonufokizorilogufitovosoz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf05144613---91187862103.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd493d177c9---76486520751.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/famivogaz.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/24480377859.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89279a08a---vapega.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef193cb65f420c7d2d56e7d9eea553b4/wejuwel.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/93180010449.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8c630a38---30477113133.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/29552043285.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wuzobujikin.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/luxuzugedulifoluvu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91ceb96ec---neliwuf.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/81173396179.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/sovoxi.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/miwuxamavine.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7d157a1cfa005d15a78eefbf067adba1/zevibodogeferimofuwi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/38647591643.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2e389e2f028d328b75d1b0add6c11829/subew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=billboard+music+awards+2019+full+showPDF 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_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 17476 bytes
SHA-256: 1138ebd507039de1798e0aad9591c113f28560a3d3492d7d44c068987ef693d5
font_01_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 11248 bytes
SHA-256: b7615e96cc45ff2687f18e5dd2da5a3a59063811b9c0f5d5fe7414e4f2e438e9
font_02_sfnt_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1