Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdbee4f644fb59e…

MALICIOUS

PDF

101.3 KB Created: 2021-07-24 21:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a6f2582eb51de7c3b9f034bcf6f644 SHA-1: 5fbc739a3317edb883aae985a7ded5702fbfa32a SHA-256: 6bdbee4f644fb59e4d1b687a8726f025495f3f3c6a6f5d6072cbb608bc92e2b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9487

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://planet-for-events.de/userfiles/file/tudejevisamalifeze.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/586e0f7647339c326ddaaba5fbf375f4/xixofevonopegekumun.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/88469775754.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/34152174087.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/31420226372.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/juputemoxamoposajad.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/modelodukuleg.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9996519f---10315005641.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/73720656801.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/29695015037.pdfIn PDF document text
    • http://emaaravm.net/upload/files/botawulow.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67105150086.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/733759d2c017a86d1e00d8a95a75388b/78761459926.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kogusamuranam.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a99574340fd---31678762357.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095c54942d8c---digiregotiwabas.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077073a175d6---kibawudexodomesufekov.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210609062940.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130ab9da0d---55817001188.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/mumerixuxufenilid.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb6d99bf2---86334598056.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/88728291569.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b78517d15---70483246669.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fd42f60c---27920678225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=romantic+restaurants+near+me+for+lunchPDF link annotation
    • 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_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 18208 bytes
SHA-256: d50ee60b5ec93c9faccdd28536607338525a41f9d389934fe80465d1dc9ec3a2
font_01_sfnt_off00015df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF4 10744 bytes
SHA-256: 995870dd0974a01f0c28c7bcff6460438a1edc1018cddf089ced27840a21d88b
font_02_sfnt_off00017684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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