Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe057014054276f…

MALICIOUS

PDF

86.2 KB Created: 2021-08-11 13:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 106b58ac99d15aeb38abdc1be5754d61 SHA-1: 93cfdd034e3024e86a758eecc6ac620f366758af SHA-256: 8fe057014054276fcff635c3c97c08b1216c4f9123da5aaa7ba78b3822114aa0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8dc7152c---zujokomezuvisomuvixeluw.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///xajuwirazimijixakuk.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kaxib.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/af5e6d6eb9d03145dd62fa130cd24b45/majofaroviwobodajarozifov.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e576298c---34851852157.pdfIn PDF document text
    • http://prmakeup.com/Image/files/duxavuvu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081017979758---zujujomixajolipenafugij.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/nowumitufumuwenuzabebev.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210702_044641.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/40881667576.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/63634415759.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/butidatu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7f0ba4fe---93652574546.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jaxonev.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qsgbtf6eeke0dr4ev6orrjes5c/zujoko.pdfIn PDF document text
    • https://chp-travel.ir/data/file/muvotubojozu.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/lidesow.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f28d03de---likisuzudezozixim.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16aebead1---romuvabu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/40218c97894cb645159b2eb513d922d7/7795106258.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lemomovoz.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xoginikiwiwewuzafujamu.pdfIn PDF document text
    • http://www.asslar.de/downloads/51971957456.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/89104365502.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jogizirekejaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+the+amiibo+in+breath+of+the+wildPDF 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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10936 bytes
SHA-256: 52570e4970846677c8ec747f6cca7e6c90be57dbc5b3583bba54786b3f3d42c5
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 16968 bytes
SHA-256: 0ffe487c16ed7c71f78270a1d2970ee04de05d22c860b67afb4994af941637f7