Malicious PDF — malware analysis report

Static analysis result for SHA-256 b522a128ec377b91…

MALICIOUS

PDF

80.3 KB Created: 2021-08-17 02:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2154888d2108c5215801b1d7499067ab SHA-1: 7ec42420fe36f52f50550c47e5f904d14e315db7 SHA-256: b522a128ec377b91296e22d847f0840c4409088f2a8b77e1776288f3faecca69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the URL structure is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=introduccion+a+la+historia+de+la+psicologia+hergenhahn+pdf+descargar PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eba4a6d99---puvixedesu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/652ff0a2c17508d30cad13d11e253626/56361491719.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210817064912.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/zegogimepuv.pdfIn PDF document text
    • http://freetds.net/userfiles/file/63041826256.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/94515385381.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607261df048f2---tulenuguzoke.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/99822533411.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/32152015839.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217231359554056.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/39b02abef9631cec67dae751b4e6d767/givesi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mbnebp62f5t5kc72u9iagr860c/zakubepif.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1eb3a50e0---lunatom.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6ok4f17n8kq33s0v2nrkv7uv4u/97670817732.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/kagasumekoda.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/miguwumakuxedavepemifa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c798c46ae1c09c1886206866da68fc57/20208205972.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b6fc16e0060a8c1f5acc3b04d3ed9d13/badefisawutokidun.pdfIn PDF document text
    • http://mldinsaat.com/image/files/21852379164.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/26053131754.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/gejiz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/h5l82p9l6ctreud4m40v258cmq/rujurizevusalasase.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/2056209713.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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 21072 bytes
SHA-256: 207a753a13f33cb61cf892e893c1c72c7c2c1bf81b3e6d1cb8132723ab78c1c3
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 10948 bytes
SHA-256: 4db9f491df231e4515896f11ed3832b8f6937ff5ad47c16e33237b771c65fe81

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