Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e32d7b7f727c34…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 11:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9304d882299f8df55289bd0f81c5cca SHA-1: ee2a17807c1e44446dfca715b7d11069921f04e9 SHA-256: 56e32d7b7f727c343c01ae63e052e0bd4aaaf2ec843b5634d83714a1e40bb386
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links, suggesting a tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=similar+triangles+ncert+pdf PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c221a783b52---dudimerazepifufupoxunilit.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2l5fa1pvv2f6tv9lshbfm4nhu0/11019581432.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/71872612451.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b7b45518---mawibonakub.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gebunoxu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/54351502938.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/54288364789.pdfIn PDF document text
    • http://nakatka.com/files/file/80881607387.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/79512424609.pdfIn PDF document text
    • http://flexa.cz/docs/file/fizinaluzosisuma.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vh42gvl6i77f3urp28qruufb3h/35257046378.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087673c40e1d---giwolisosafog.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/majuwomuvuwuv.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/71506532104.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9499491bf---48904686183.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/8737213591.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/49e6fdc39e57db972d17702bd2e69078/21546798277.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/27872555279.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/39891358289.pdfIn PDF document text
    • http://aven.su/userfiles/file/51923934612.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda4b1f3d2---40687278818.pdfPDF link annotation
    • https://rmduncanrealty.com/userfiles/files/vemeruve.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/84387310512.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/muwibol.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 19792 bytes
SHA-256: ab7000e9d72b04624a0d89c9ab0e3cf75e02018f8673a148cfd124c36860a46b
font_01_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 10916 bytes
SHA-256: aeccef551a3584a52361fd4d4b9dc1fd8b5a6dc4a8f2556fa57c2e60411e6bb0
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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