Malicious PDF — malware analysis report

Static analysis result for SHA-256 552cc0362fdac206…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 03:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37cdb89b9525bf322becdb29d9bd6365 SHA-1: 85279d5599b2779cd979975d724db404fa203209 SHA-256: 552cc0362fdac20689be0b03d391b30f9e6a3a1d498878d9b8a9dfa29b35e4f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://netmode.net/app/webroot/uploads/files/39917834737.pdf In PDF document text
    • https://raljob.com/userfiles/file/73221829519.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nabusunajotoxotese.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/terodipizupez.pdfIn PDF document text
    • http://caythuocnam.org/images/files/gibefigimutugaxemeroni.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xikudaw.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/gojenusafe.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/zonapemukuluroganobuxise.pdfIn PDF document text
    • http://freetds.net/userfiles/file/gobuwunegulimeg.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614177cd9a81a---42764540655.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/67258082788.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/54919992840.pdfIn PDF document text
    • http://robbes.nl/media/files/36180796605.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/42375950784.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/bojinefubam.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912234410.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/42209337579.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_E8D10B8CBEFB21DB.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/55074653564.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/janubudilekutalezojelijeb.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/vejamuwolam.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109062143006112.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410bfbb9fcb---zunalaxojolaworegokuru.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137812d56432---58122560756.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/91255423461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=teenage+mutant+ninja+turtles+2+full+movie+freePDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 18868 bytes
SHA-256: c8f2ba67dace507b1648f56559e52fc92953b114298097311ce412c785cc8f54
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 10936 bytes
SHA-256: 0a0df5f7886c962052d48b7ddb7eed6b434484fee0e508926cb203e7bdc5dd12

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