Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30405c6c1fa9203…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 11:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4effbca3f42bbd6059a93e2ebe1c2cf4 SHA-1: cbef5c6fdf3fb4e594b6dc2684cacac5eb7c7b8c SHA-256: e30405c6c1fa9203ef489a05a69f9e317cc14c8cb704985234ac4ea90222edb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://karpzbeldowa.pl/uploads/userfiles/files/25974777837.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b54373f1f---20606413438.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a95b9bf5468f1f43e0840555f3a5c83/zanutidirinezalelebadun.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/32722276618.pdfIn PDF document text
    • http://anm-av.de/uploads/files/sozukemekumunoruwamo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/43552809082.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/dikubuwefajamonilenuzisi.pdfIn PDF document text
    • http://protok.pro/upload/files/31633859697.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/rakusovof.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n91snmvpidjutf1cmpsqspkpos/89991115924.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8jneubi8gjfhv3p1c3igm1ed2/faxalelireko.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/1194859662.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ifug8nf34hdpri42qhgtbmq1ar/latufigesenipetiwixol.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/80519638659.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/3708467938.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/bd7580e5f3d7ad6304d83103fd458050/93405243673.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772a746e90---rapijolatesedolamo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67366401179.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g7rhbr0ednnv50dmgmmvb0tc05/62964565111.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62bae521cd---rokidaropakeso.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/xevewoduxurefetemoxusitof.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/205472924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=business+analyst+course+syllabus+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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 17192 bytes
SHA-256: 337191c013876269cbf0cd6810672baaff7f5e44dda65799a259541c96ed9c04
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 11020 bytes
SHA-256: cb9f9c7f33f143de8428defa359a4548ee2a40dfa48c77c911e8757a24ecc621

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