Malicious PDF — malware analysis report

Static analysis result for SHA-256 be649a013132f6b4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 14:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fcb5cd3fb7c7fc408136750fb9860979 SHA-1: c9e118094e6f17e5216268b746563311ca2fca8d SHA-256: be649a013132f6b4d3652ae77ac7f7af51d7e74a3f2fa6ec8c9c37e93ef19dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 0.9980

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 http://afghansolar.com/userfiles/file/19288638253.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7f6e0147089a2a959d35b46279413ae1/gufenuvisunupukukatamex.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/16817815536.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4611a041c961645193f0b22539ec34aa/pazudafexuxekug.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/323b320bbf8b22a671c46b42f224b083/14635853250.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/51543834323.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/14131099964.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/monunuxotulika.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb063b95f---ditutamoguvoxog.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/25448836901.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fusizipimegupidil.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/9777524627.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0015620f---fijowirubip.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/naxusagazetuw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad4edcff1---97293141607.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/631b3b704e17a6e9437566ed589f600f/litimuweniputipawux.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/38746252042.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/litaxope.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4aa4cddb790761237e9a92b88d1c18cc/dunopovibenowozinasevid.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pibija.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/64545469310.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/pufiziliviwekeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+information+revolution+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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17628 bytes
SHA-256: 2cfebdd2a04bfc37970ae8150cefafd24d4e9e1ec78d05bddeaf2ec4b7271139
font_01_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 10724 bytes
SHA-256: 2a248b46e3cc95279072ef2b97fc966a2a165ed946e8c605971831c762baa291
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1