Malicious PDF — malware analysis report

Static analysis result for SHA-256 138586cf4e7ee96b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-10 11:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bef7472cf40c4242c956bb9837f75b6 SHA-1: 0249e58d1168e8466ebd0a517610011066928abd SHA-256: 138586cf4e7ee96b115abff17d434155e89adfd29d6549669c48cc1cbbb761b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, indicative of a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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 https://archism.ru/uplcv?utm_term=croods+2+movie+online+watch+free PDF link annotation
    • http://snuhonors.com/userfiles/file/xesizegutobufimo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642b1cee20---xamejepumigudelupaxe.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/kosifebaludiminuf.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/98510558040.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/124e205f549368075758a5642b2fa29e/kufapujikefufewamen.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/79492206517.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/44702241138.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/91546835679.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/toxup.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea4518029---38587379488.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/lebipuli.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/golagarinesezebaveze.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xamezakunugotanewame.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107546b765---11498381805.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/1606884938.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/33561425802.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9bb6baecc3e286b9bbcc2fc4c3fe89ee/29512291241.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/19273549960.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/12971939100.pdfIn PDF document text
    • http://iphysiology.ru/upload/45351499004.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/jabuk.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/vimosivexubo.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/30946987071.pdfIn PDF document text
    • 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_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 11044 bytes
SHA-256: 4a495cec6915655e295d3d9de18423f6f0a02822f3c57e2fc5a343abda18272a
font_01_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 17804 bytes
SHA-256: 1cf05a21eec71c8b972759bfbdef0cbea8f6f262258342c520c891b8d2bfc599
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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