Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6403017b8e62b19…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 01:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2812236b3c6afcf7c2cb65ed14353cc5 SHA-1: df39f0b634f3a01028b76a5d5fa57927c25841c9 SHA-256: b6403017b8e62b195d20242900ba1cc1e56b2758fb63db1b3436f0fcb2f2b5df
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://5percent-design-action.com/upload/users/files/19060327584.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9980b9916d---rusokarudi.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/kirovoxo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/94028728569.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/sokikakared.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/05qmgtuufkf8f4s5kipcu4fuuo/vudesijenowonixupujopojix.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/bubedopavusosada.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/39818582225.pdfIn PDF document text
    • http://ustunongel.com/image/files/fopono.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3a39cdfbed5d05eca28c042ea054d8ab/73008283951.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/61205545213.pdfIn PDF document text
    • http://honda-vo.com/upload/file/84274997322.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/bimat.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kegatofakegadaxi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124d308387---kasitowogasadeji.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/kexosanejedejojodaxojiro.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/11985236035.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/nidujuwezedubopikijen.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ad890d56---37535833393.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103814a844ee---gexekalodivilu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/perisulajukunizumikolu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743eb7c970f---dixogapumasabawa.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/dukadari.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zajofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=needs+of+the+body+worksheets+for+kindergartenPDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 18504 bytes
SHA-256: 6f0b87689d63e0989004dfb83c5b3f9740c331706fb80b72cc8f683a6d6c5488
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10996 bytes
SHA-256: d4c4b53ffcad5bffbb17a98b9fdc37192eddcbd199aedb110b4a3bf6b6c30da7

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