Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdae8324cb679584…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 08:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12f93bc985a86d453e0f0d160c23eda6 SHA-1: a06ca2ecd47b98d9fba5ff834562175a94e58987 SHA-256: bdae8324cb6795840555babc279b05dd8598750fa63e1ab8cf8a22f39eb3c0cb
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=dictionary+of+translation+studies+mark+shuttleworth+pdf PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612988f78a202---lirifapisolobiroluged.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tps33ufosv94dn5hhegaenhjkh/51974234881.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/zukidomevegow.pdfIn PDF document text
    • http://adveotec.com/img/file/wowesesowesabarebijogik.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/mepituselasibixaxozurag.pdfIn PDF document text
    • http://secretinvitation.net/images/files/46977550342.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/48033484521.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/90064465839.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/53809104677.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/78200381097.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/10323d373da786fe45ead8760db6e4f5/65442463520.pdfIn PDF document text
    • https://businesslife.com/content/file/21106346838.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/42786764672.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/15168339557.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///patewolefujoteleneni.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/645f029d0820d044e6b9d21fcf99d633/rivejes.pdfIn PDF document text
    • http://metabolit.ru/files/file/57087475700.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/99848123326.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xijevalafobawep.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/jakigekejin.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/gaterubogedinowonijagi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6f23223e5fe6078d4882bc581ef5f02/35632407571.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/gotubedagotadesebafi.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_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 11280 bytes
SHA-256: 48132d0f05009c0db3bd4b1444ec0d84accff2811e7ddd633bf0adf41cc58105
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 17964 bytes
SHA-256: fb7e2d41bc0cde319a352f9ba5a68e7b238324ac5f0ae0cedc8d82fb870f92d2

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