Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2ec09f65b58fb4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 04:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3140feb2b0f29692916e9c41f27a9c98 SHA-1: 62285f2faa129a7dde2e52451764985481a46f5e SHA-256: 9b2ec09f65b58fb4c6f486095bdbad8762fb1761a048d6d50ff5d17842874cd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect the user. The presence of multiple links to compromised CMS upload directories further supports this. The sample was authored by wkhtmltopdf, a tool often used to generate PDFs from web content, which aligns with the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crewmak.ru/uplcv?utm_term=mlwf+challan+form+pdf PDF link annotation
    • http://daieimotors.com/js/upload/files/67450672027.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4960a4c8c---jiziroxosogimogova.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3f70763949c5ae5975e5ed1fadf58ecf/84704442079.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/73577465741.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/sotedabefasalanapelej.pdfIn PDF document text
    • https://airxps.com/userfiles/files/pemakudavawelepaweg.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/7657649761.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/22052864434.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/35294813361.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/wimewuretiwesisa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/10865318973.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/50322206428.pdfIn PDF document text
    • https://seikai.jp/free_images/files/kivubotediza.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/40119227165.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609806c1278f8---nubozufomamazuzulezuse.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/96616918867.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/9799773431.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/tukijosazixidizotamaf.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/monivilalewukoxijezufipuk.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/61261089752.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/73733346706.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/12392848301.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21aee21da---62646347337.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687ac24f08---wesewu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a505fb3f1a0---36847761004.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b40abde3b52---dewobunowokasebuzolimifoz.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/91469051299.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_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 10472 bytes
SHA-256: b03c5cbfd4b388a677f49dff375487ccf0a67e26b4d15349a119c64c874b25d6
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16988 bytes
SHA-256: 18b084eec1a9ed41b778dc65b8eacc938cefebd8a011d2adee8a66930fe3579a

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