Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd813e7da823ca8…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 23:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a972e360dda7bc238244c4e5ee179c06 SHA-1: 8f5b1bc3cd3988022c428c62d0e13e3d76ef60d9 SHA-256: 9dd813e7da823ca8be6eb1639ce5b71edd6d6dbdd270ffc15729c49ae889c2a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to distribute or phish via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2896396fcee0de3e95076959bb63bd9f/tadolonezol.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609826c900682---mekawepegokipifozufusonaj.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/siwavozanokisitu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/30090735923.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99cfcf62a---33775327124.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/10169945435.pdfIn PDF document text
    • https://digireg.org/upload/34233089136.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f7a7482a---mebagudeku.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/23682237489.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2588284f57c0823f41025b09f38954ac/wotozupikewodebutife.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e645c62659---59921185062.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/40694807589.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/22827062430.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b309df5a667---65816343963.pdfIn PDF document text
    • http://iphysiology.ru/upload/todubenasomebak.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hgqoov4fjfa44ce16vcjgosenh/podupesigawadawalej.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qhsni4c5g861n7be2lte1fdk0p/tagimedorigulawerabase.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/o419h71ingujgr0c7hm2kcr268/69076615862.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/2755591407.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a272ae9faf2---xilizewig.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zegodolafiw.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/9011069849.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/xakik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=baixar+livro+corte+de+espinhos+e+rosas+em+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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 19156 bytes
SHA-256: f7094037d1a6f8962ff09ffbfb7d55a2a9b6375f5ef7c8f8c7b1e35b5a701c87
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 11108 bytes
SHA-256: edb6189b82c899f0c68d99501659f244e7e6662c208143f47060a46ee4547d7d

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