Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac04429b0ba55e1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-31 10:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eca3a3b03e8e3c99f7b7a3d7f6ae4a2c SHA-1: 8d8ec1032e835bba17b59473b831891cf9900a30 SHA-256: aac04429b0ba55e181e8484abdbf8a7181bb0ba1415e3f4caf6881b64fbb1c92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/dixiwaxejalojoliwejo.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba50b1907---25736508027.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zuzepuzil.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb7007039---83345223553.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/212021251244.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/475b53fe6e47a7058be8fda5f6c3a525/97403975286.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nojukukazipevesin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mttd7hog83j759k9h9e6kdndf3/kojajikuxigulelabuti.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/4998232397.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/suvegoxipegexamifijelu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084f63574ae4---60898700006.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/53946170467.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/vowezazujax.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/birudagikezikagijepelos.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609920aca2ad1---16524742535.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff257e697d8---sujitozaretadizozavuzu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/161514002760e5cd32cba14.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee73c154f---50300076776.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/29919940731.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0b9f1a82---33347193428.pdfIn PDF document text
    • http://belloverde.net/emailer/file/xebigokisapezam.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a6cb57bb---60442992934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+complete+penny+stock+course+timothy+sykes+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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10992 bytes
SHA-256: 7c8628941942e2dc3e2e1f7cab9922fa7a19e7df5ef4b8a65a1c9dc737ec6b03
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 17604 bytes
SHA-256: ccf909eca8c9735ecd5cb237fd8223fc24ff1bb0c9c5bc6ef01a22005a0e00ec

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