Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe755efaade90d43…

MALICIOUS

PDF

74.9 KB Created: 2021-10-02 22:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5f0b076c4f5e8ee5a2ebdbd4302ea79 SHA-1: 3c4b0868786afe640814623f1f5c1488d65490c9 SHA-256: fe755efaade90d43789151788ef479062f660eefe1cd9fcce0ac85d9a64e5e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attack.

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 https://philabc.ru/uplcv?utm_term=nc+child+seat+laws PDF link annotation
    • http://hidropro.hu/upload/xipejavewev.pdfIn PDF document text
    • http://innotack.com/userfiles/files/7753358881.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2lp7kvv7mfonmve1sqv90kn4j2/gofilat.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/10478815164.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/pakurivi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/tewukose.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/25767841460.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/26624810676.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/8070880765.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/gobojupa.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/vudazusov.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/91367522766.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/74498851267.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xegarujume.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/pojivasopozibat.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/99093118554.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/51954910058.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/46746041671.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/nepilorakomavusuzewuzusu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc596bb9d---20343546840.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/momozevaboler.pdfIn PDF document text
    • http://prestopc.it/upload/file/xovuneva.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161513c6b0df53---puzuxipezujutuw.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52906814103.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/26841000558.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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 18204 bytes
SHA-256: 41efbc3c6f98aa20fcbb6404a961d4f442c8fa177dabf65dd84f990391f6a902
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10204 bytes
SHA-256: b40fbf52e7f342a90db205aab97249a667cbc0fa2d2ee321245adf95a12f598f
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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