Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1ee0e9ffff3776…

MALICIOUS

PDF

81.2 KB Created: 2021-07-05 19:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd95ee7869c61d73f5dac93fa396647d SHA-1: c31bfbda90113b825bae7024952e2b1da56c2d59 SHA-256: 3d1ee0e9ffff377615eca66e1c04a7db67c2bf479d534bf0c369316249d03fae
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://inwebjor.ru/uplcv?utm_term=htc+touch+pro+manual PDF link annotation
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4948da0d4dd42d32fbc9e0c3996795c6/meburi.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/64903475760.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/zelakeb.pdfIn PDF document text
    • http://whatdwellswithin.com/file/43296559096.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3118e694f0---tupebufulad.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kuvobozelumu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/nasibaxesev.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89fd7ecf2---badewepesuzewo.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/97a4b04f3ed07f5a552b06a1017ba336/guzisonowo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea142f5da---pilekodidawuduneropiweze.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3sqp7bbfteipgv05c9a6f36ab0/265342605.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/14536498048.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hu2korat8s18f9aip5u3rrf8l0/gowiwupejox.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/87284823344.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/hnp17m88vucbhi6hv19f4kdd72/76942591927.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/muzarixuxosularixagorire.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/82529502790.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/ranakif.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465c49b4ac---wowulozomoput.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/53987223196.pdfIn PDF document text
    • http://fotossc.pl/_files/file/62464960878.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb304ce021---21832427856.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c92dabd02c1---54077744222.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/30223897142.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 2268 bytes
SHA-256: acb4b4b25e50f7685ecd78cd215bef76039b8c36bf651eaf5c5b48906fb6dad2
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10340 bytes
SHA-256: a8c82d718c38dc7eb94346bfa5a8ab501889e6bc837c8a235f022b18dcb00b0f
font_03_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 19500 bytes
SHA-256: efdc175a470142e35acc840b6ede99ae0d0407d81662a2c13488af190ed9289a

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