Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1f0d8d459d5c4b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 275979078308d1cb2a13b5a08d147a16 SHA-1: 9ce7e98af3cba9b4eeeeb96e59291ec0d8480e43 SHA-256: 2c1f0d8d459d5c4b58ba1023bd0da07c39665d5692edc5913ab0ee92b2dc5e84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple external URI heuristics and link farm detections supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9861f36f---53327561778.pdf In PDF document text
    • https://adikkedua.com/contents//files/3553280303.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/newuvefanuga.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8fe5c7c62dbd5344300ac245a7d961a4/25069986246.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/85894ac52e33da7fd6175d5fe9af97e2/21135629710.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70fb5e26c---52810018035.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/80127186364.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad82eca17---mijiserekapurigakejopa.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dapod.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3428dfa3d74f65517b94fbb99c3eae20/vasuxixedikadilo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/65077229686.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/4578609630.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3cc79afc---37647404328.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/72752760111.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nereremekuzumenapezotadu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/wizilagibimadabufavofe.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/87325390952.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xuduzasitovunuwejuv.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/vijutonebi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fhovdmvdr1ucqbrt4fd0dkiap4/67466919080.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/33476023261.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/jiwuleteboz.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/katajelujaxoguposewar.pdfIn PDF document text
    • http://st03.it/userfiles/files/92471032601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=singapore+math+olympiad+books+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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 18128 bytes
SHA-256: 8b14e92169e83c1014a284f0fe3c8b2d2079badc4d22dacd64bab682b855dbca
font_01_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 11364 bytes
SHA-256: 77375dbb5ffd210a7723c71f5cb50fadd18e1c4eba18a824a3cbe3bf192c5983
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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