Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ec45638f8fc894…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 09:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86a84425d9bdc60bef1c32c73fabb3ee SHA-1: d5443797f2dcb9ce51320babd09e04a607b49e7a SHA-256: 89ec45638f8fc8943c28f87f03d6498f7b17da8a036f55134ac39ae477600146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=justine+marques+de+sade+pdf+gratis PDF link annotation
    • http://ijdssymposium.eu/upload/81927456200.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/34518357805.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160eddf4283073---dumexefamekexeru.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/letabumufesaxewefibeneven.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1je3ro2vo3kmbl079tj20a3u06/sipewegax.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c0b960d6---bixoximim.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/24v2hphqcpul04u9cgp3lvs33u/19949802178.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/9025839865.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/rusakudi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d7bd3dba4f0bea35234bf075a6b7b566/gurutajip.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/32828842184.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/legizileravatula.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/detasofedu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/povokumiwonetod.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/79314366560.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/7977747090.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dd4f0b0864c8d8fe706713cba2c7426f/56641542735.pdfIn PDF document text
    • http://kccmaul.com/files/files/wapakegovozabaperezazabat.pdfIn PDF document text
    • https://euchebnici.com/img/file/18024771784.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/54560794845.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210626_8198773B2A99FF69.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zerilawasesapatofe.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/89360526452.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nesuferujoxavamizuzi.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zevedirapob.pdfIn 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://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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 21184 bytes
SHA-256: 7d21a2b983b3034d960affd6b405d07275323b9be7795fb822a30c7ea61c1321
font_02_sfnt_off00014145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14145 10912 bytes
SHA-256: ce72c5cd07748fdcf05da9e3b64dd46f229cdb65a30d664e627059b1a6c186e3

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