Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd76af5a3a03a22b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ba1b77a8a754add57086502b5ef5f4f SHA-1: 58af22a286580a9661da6e3837ae6a177115dec7 SHA-256: bd76af5a3a03a22b095e0f818c30c54019fd662e1f5dc878ff139fa2cae144c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are associated with compromised CMS uploads. This pattern suggests a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gediklimakinahidrolik.com/resimler/files/55057753149.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1c3be710---toxakiramama.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3484mc3d6ri5cd9fu98sbuas70/logeliviruba.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/masesoniparuga.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/31246983111.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/53292007300.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/trfit1o7ocb8v5cmncfleknp12/9401391512.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/29398667935.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/55868228104.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af681c4a0a5---29346360279.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gojafukelizabawigu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9111c2070---55694823487.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/8235922153.pdfIn PDF document text
    • https://reniuved.it/file/funona.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/44438392961.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061304251877.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3445b161---pewafamoxomidu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/59827302661.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5e781fd95ebaaaf328c0ecb6a288f1b5/87022072209.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf2d7515b---16597771724.pdfIn PDF document text
    • https://italvaping.com/file/75337775388.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fp4difmstpgmraftuomijcjnl6/38918758385.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/vefuxebe.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/53498568257.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/38721335558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2010+toyota+sequoia+platinum+manualPDF 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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 10872 bytes
SHA-256: 1458ef8134abbb3a3361122dc5cada62ecb405a6237d757fac7c59d7fc50c6ca
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16176 bytes
SHA-256: 504c20f788ed82750695a0ed9ea9b9890cfd41601faea8a9b3b47f87fccd22d0