Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57c17a3dc86f6e9…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 10:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99d94048429d6c973e7b187360b02e85 SHA-1: 7a61b0c9e70dd381b95df790280f1fde50d19c0f SHA-256: e57c17a3dc86f6e943131fe7fef1ddbe3b521aac593be03df499a999fe4fe186
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to domains that are either unknown or associated with compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis point to a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160729bfea055c---mubakuga.pdf In PDF document text
    • https://istanajp2.com/contents//files/jazokukemomubepasir.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/satazowifawazivarukibi.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bjqsi4gofvjmrl9ighrvpea2si/4301152899.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100807079788.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/25/96081878848.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/sutodomutofad.pdfIn PDF document text
    • https://x-software.cz/data/file/67078804397.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916cd3b246c---71160569479.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b918c6d300b9e97981a14afba3b6f160/5118702509.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/fadupekejupun.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/50257106036.pdfIn PDF document text
    • https://stopserv.ru/files/file/4395425792.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af596110111---32139520885.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608de061cbc78---99359282029.pdfIn PDF document text
    • https://go2germany.ru/files/file/47997214750.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cb85999f3822b2ae78bac872b77b0708/wujelogekedizufu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e7c5e649---torizamenewetuzo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c81730c60---fiwepas.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/duxugofogapij.pdfIn PDF document text
    • https://led7.ru/file/6968325326.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/vivenebovatume.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c72c10401f21e1efe84fdd8587fae31/81468550912.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/7010440195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ir+spectroscopy+practice+with+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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10576 bytes
SHA-256: 74bb4e036015c6483e409aa26345ab1e09725f230ee326bc86ec7f7ca50baa2a
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 16424 bytes
SHA-256: ca1c5f1f6bea327db1a948fa5a481334585c513b2729c0377a8d8e0c7ea0a636
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1