Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc77d1b017500078…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 16:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63d0c0b95a9f7824e62028dd4371d5f0 SHA-1: 44fb05746ce16b4ff753c3a349dfdae8b3c44e87 SHA-256: cc77d1b0175000785fafd154dd2f16bd518e12369a079fad95349952145566df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee0d8103c---51501089226.pdf In PDF document text
    • http://php-lounge.de/userfiles/file/xagudumugexu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/89b69f9c15f648e9c0cbd26c3fb2cbd4/devebijivazifuxepamubid.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/towib.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/kavidatobubimufetizala.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/vebukoguzatarasof.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33186263844.pdfIn PDF document text
    • http://yejida.com/userfiles/file/16940257997.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/zomizatu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/83244547365.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/189620ca13eaf974d1517ef3b4293e7b/riduzalimosibok.pdfIn PDF document text
    • http://kleiberit.ru/files/file/17987278376.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/92746072249.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/29062056950.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/16902896966.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/vuxakekolanebakimokulugut.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608318d38aa80---48493313781.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210828234753.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/sugakagetozixu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/36162897378.pdfIn PDF document text
    • http://zgic.ru/!upload/files/64434517750.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d227e616fe---givawapurulojasarezejim.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/38289589357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=flags+of+the+world+printable+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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 15556 bytes
SHA-256: 2c6350343f0d6e4cd1da633697f0c98433d92a7bc425da0c2546f0eb11ecfa04
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10980 bytes
SHA-256: f0b57255130fee90f18fb46338114bd5c1247feff48ef11451f3057c1b7dc232

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