Malicious PDF — malware analysis report

Static analysis result for SHA-256 0651292c3daec468…

MALICIOUS

PDF

91.8 KB Created: 2021-07-13 20:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b107767365371fe812a3f916c0f5bfbf SHA-1: 80aecbe7dd90d4a732e0442fd3ded3783a8dcb33 SHA-256: 0651292c3daec4682d0fd36e429e63f600cf80ad9813826f817aa2e8cb2b9880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm designed to redirect users through multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. The presence of numerous links to disposable hosting and compromised CMS upload directories supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8b5ec9a79b6da81f4ba1b86054cb7ddf/34175946618.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d3vqgdg9jqk6ffs4m925h8grju/42248729158.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/do6inc4ji0iktps48vdpn07sm5/53638211871.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/79273076828.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/13538825369.pdfIn PDF document text
    • http://jngf.cn/files/file/xasapogi.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/vekejobiperugejozel.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/19120698238.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2pl6lp0vjf9e2jkr6kfmm5j8km/4001060136.pdfIn PDF document text
    • http://thaide.org/userfiles/file/66597922041.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c4acc0b88---37944400053.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fepugavexurokikejefo.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/subafevimozaguluteb.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e1460eb4---97548761458.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/lugunariropuragibefojes.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/61632962445.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d23e50ff7---lazoratimunisi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/21808550252.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zejexuwosijukakarobo.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/27409180468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rpg+character+creation+questionsPDF 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_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 17684 bytes
SHA-256: 903c55b2f9b4429324c2359b2e9e12652d8bf977c471a6569c5123093c2c7b34
font_01_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 10896 bytes
SHA-256: 80d40c6aeb9e806132e11bfa855bc1c27c80fecf0e978c1e836435d4b82c7343