Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ae86f2e6604f6d…

MALICIOUS

PDF

91.8 KB Created: 2021-09-05 01:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b53c99a54c907b529ddd5c0f8e016dc9 SHA-1: 984bd827791006f6c45d5499103cd7e6168ddf0b SHA-256: d6ae86f2e6604f6d3cccdb88843424c32c3712e1fe245358cb9b1a482315c42c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malware or conduct phishing. The PDF itself appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad62edc4df---zalugusixekomawitiv.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ctipdaupgtq43drfn1fihgb9m9/vopeberodonowejizukofewa.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/54268306800.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/47281066038.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/giwoj.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8cmkb1cndk9mupamm5deed4u17/gokuluxana.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7f92266012c51dcca29ef193abf8ab46/pexutajojikim.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/rejifodelinodosa.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e860c5caaf---bunupavaginoduv.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/junuzexoresag.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/77520036088.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/gupapusidaxaduzapu.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/25692954286.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lijixuzapezijodozuriz.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/41681763560.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/37368041184.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6969a085a---pokazexexejaxonok.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607749229ef86---26581431838.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/ruxaniwoxomamamijimut.pdfIn PDF document text
    • http://net-marketing.hu/images/files/girusimawege.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161129ce65687e---nemeboboxutelalepipa.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/72044075623.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sozituj.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/087e3067d05561c78730cd5415f22632/10207462577.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611408e3082ba---wukasizijilarufugosos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acel+equipment+rental+rates+2018+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_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18640 bytes
SHA-256: 2ef22fad5581b4aac9edc984b346816be7c495db445bf62ffe2dc96becebea3b
font_01_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 11392 bytes
SHA-256: 6e526e6ed01b01d3afb7d8094c7569dfbb97948f7a13724828599e70bd6eae16
font_02_sfnt_off00014937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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