Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9563d1db0c0d110…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 06:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9583f3aad43bbe2421cc06bf620ea0ff SHA-1: d3b8df4814941b5fb1f660fd5e14c5742747989b SHA-256: b9563d1db0c0d110f4ec3053dbc4fc831680e37d422d598b12eda9b4fa37698a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JS and the link farm structure strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b42d3e2c5f3c5304693b600667d93c/saketosugomekeratome.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ba35e4978172503d2869ef276c9a2061/defox.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/sujosomafaro.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/pibomanegodepop.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/kesowewalagadepoxakunuda.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/427397140828311b70b8edb5184a6267/metimopopixi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4adbf34c54---93801296996.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zebunudo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e43c992d27c1e62cc7bb6e760af0e7ff/ruxivukujisanuzor.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e3c66f99f45e3ea10110e9ff617553ae/zigunisido.pdfIn PDF document text
    • https://energooptima.hu/upload/File/36446962591.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106210920235016.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f526cfa95cd---21875114531.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29bd1e089c---18472005954.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/maxozoli.pdfIn PDF document text
    • https://teamcode.net/upload/files/34644323584.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/928f6b8bb68f4f24718bb180ac320d6e/41072959856.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/34741532310.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/3355778545.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/samevave.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/77198607336.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/towus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=factoring+polynomials+using+gcf+worksheet+answersPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 16928 bytes
SHA-256: ce84a5126af5c60b07a688cb480e1532cb629f48684015e34cc8f1e7bb1899db
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 11296 bytes
SHA-256: 6a8ffa5b9b8e504adbf0372538cc19d6a87138cd5c1847e2b605df511712a096

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