Malicious PDF — malware analysis report

Static analysis result for SHA-256 4963e543e822187b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 02:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6639150488e8a67ef0ac79e1eb2e7de1 SHA-1: 116d0bee54160e4615c1d44d74535c9e4c7bfe44 SHA-256: 4963e543e822187be5bb209fa9d3ca33035d3f42fd33d5cf67e30fdf5349c855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03c52f64b---63791202664.pdf In PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/18753660416.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f54503d155c938cac4a672aaf47f3f5a/54008564527.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nqq4c82c19r7bk1g5v9r4d51ni/33269238434.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/4863564751.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ffjjkg42aa1p08ou4ges8cdk4e/63135142633.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/80080239425.pdfIn PDF document text
    • https://onwater.my/uploads/file/11733981241.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/64004548690.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0c97a25e928d11b323065b1be260baa8/kejuru.pdfIn PDF document text
    • https://tavio.ru/files/file/96195766046.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/kawuwuna.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/37023410850.pdfIn PDF document text
    • https://medpressa.ru/files/file/46542871670.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/28433158483.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/99510294076.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/59976ff659525674bda9dc3287cc14d9/22196824950.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sademetuvidejuravofug.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/95712199395.pdfIn PDF document text
    • http://healthywithhart.com/res/file/73886624687.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b564228e9a2cbd389dee0c7b7defa10d/jesame.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vuxodulevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=basic+english+grammar+betty+schrampfer+azar+4th+edition+pdfPDF 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_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 11512 bytes
SHA-256: 6a2b5e4cd3f403024fd362c28bee6c64fdbdb043712f37c4c115f7c57aa93771
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 19468 bytes
SHA-256: 93a3e11e35a14c523cbe8141f0d01f0edc75358d0b78324645a4ef953def988c

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