Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da069ac903f42d…

MALICIOUS

PDF

94.6 KB Created: 2021-09-07 01:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a338682f101acb1a58ba7ec222eab94a SHA-1: be3dd6b3c546a1e9255673ff8108f7dbba9fa055 SHA-256: f1da069ac903f42dca1db01e58413a205a54654ad8da6c44d0f06677abcda690
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection scheme, likely intended to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e3a18c02743f611263fb3ed7c50dbe8a/wevozoxivitasub.pdf In PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/48052167982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e433bd24---8375196645.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/653c78ade2d1fd351f366f925224d266/41325693022.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ee7c515a2cd6ae3c6b93cfa839a89a2e/dakukobenanavem.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4ae8b3e7fdd7238d2a5514385a81ee0c/ginufuk.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52f645d307f81cb1d33be18d21bbcfc7/dibevazaxulisixonakez.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/rutegim.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081824b2fe92---6910297283.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sumuxedefuxekujugirixaf.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/082346485366.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/wuvilinabemaxilokakiwim.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/21676255412.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/77490771733.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bb96266b---gejuxigawulimumilomigo.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/jigesivenevip.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/79759329807.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0078aef5---xonadopa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e5221aa373599c91578d8c4070a2891e/buwugirikakazululo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083282776fb7---28028445896.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/11702088260.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/96833916565.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fovefefudajisip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=i+love+pdf+jpg+to+wordPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zofafewuturekumojap.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_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10380 bytes
SHA-256: e7b4ba4fb069b1064c2319e58c0db3a29a3134c10acc767672c18c71df2fb57f
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 19020 bytes
SHA-256: df4d03690b5042351538db23845109e8fe4e08f0b821d052262e896a6140f177