Malicious PDF — malware analysis report

Static analysis result for SHA-256 c039d04049857bb1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 07:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f691d78359bbf28333a3147c25409947 SHA-1: 9661f725373fb3c54f3cecb3efbf864dd9eef3ef SHA-256: c039d04049857bb1f16b91657f3100d0cf26b051fdc586cc98bce16e67ef3f95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d3ca9c2b---64904876844.pdf In PDF document text
    • https://steklo-shik.ru/userfiles/file/22164639335.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/40994580173.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/58244793153.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/wiwazob.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/68193577363.pdfIn PDF document text
    • http://apvn.info/userfiles/file/tanudosidopixuzumuwokofum.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81cc6c3199a7b8de5b102c1cf7564ad/30146328068.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd0aa3edb---xununipobu.pdfIn PDF document text
    • https://adci.vn/data/upload/file/gujiwibuvoguwig.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/68973858856.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608332217d7b2---fasivodapuwalazonabeza.pdfIn PDF document text
    • http://rilta.net/userfiles/files/mamatexanetupevi.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/nefukik.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbec25d86---zebisobupape.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j3imvomre8mf49avf7ufovo25r/kofasorisamakex.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66b491ad---59135542902.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nejowopubolosubodibid.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/sijonezolepop.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f18f7a127---11797619948.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/34900550312.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/wuruminajewimarabef.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kinusozifakivanuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mechanical+properties+of+ldpe+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/13245647084.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 18100 bytes
SHA-256: 072712927d14996273cbda3fd4ab2518f6f8733d077d5d0ceb8ff4fac1c941ea
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10708 bytes
SHA-256: a1c15ec505bee971311b2eccb34f2483e04c4b670b70fe62585084879261f792

Open this report in the interactive analyzer, or submit your own file for analysis.