Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e41abac12e31b3…

MALICIOUS

PDF

89.9 KB Created: 2021-07-27 06:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c168dfa239f18eca6f1e588958933ed SHA-1: a972a40bfea3a487264349538c21f6072ff7b783 SHA-256: a0e41abac12e31b394bb3b3ba8feef1d2ea1b9e2610621ec0e91e20497b2dda7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm used for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b52c0cd38---gaberilabupisivi.pdf In PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/cdf546bd2cc258eea935950516ebac1f/gebebejeveleti.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfad95b7bd---87728857270.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084da199c837---28242231903.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4bbc9611---dixekoxoguvanusatuzi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/49482710444.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fdf6a2f4ec7480f1246c7264a30bfe46/21784396274.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17d6a0af6---85003919337.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/92312510536.pdfIn PDF document text
    • http://emeat.ru/var/files/vodomidorezuwelego.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77e17aca---49139766637.pdfIn PDF document text
    • http://mextro.de/upload/files/mipusogitogizefe.pdfIn PDF document text
    • http://cityfate.com/files/files/83275337532.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3569e485d405258d882f8890e4e53e62/pajalukasevili.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/da6dd5521f0f1d9855260cbcabcdfb3d/liselokuxozakug.pdfIn PDF document text
    • https://invest.pl/userfiles/file/kokivubowijujivewobus.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/93964118393.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/524894467.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/luvuzenavofidepamakom.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/49103247317.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/takonojabune.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1f5c728d8a4d5d35a56d2ea969693788/kuvebewizamegijeganabazeb.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s1m45p7gdp77m7pbe80tt9lfi6/bosubufo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/8357517926.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60865562165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adobe+photoshop+touch+mod+apk+2020PDF 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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10992 bytes
SHA-256: c2d194d7ea2f22942686f126b53b7c08f680cfb6c52fc9ae7b05240d49415b8e
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 19592 bytes
SHA-256: 08bf542211118e424107e46e4b0b5f61e05c4b17ebee7dc9c8d556efe03c008b
font_02_sfnt_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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