Malicious PDF — malware analysis report

Static analysis result for SHA-256 595b91bc5a26bb97…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 16:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3fcd57edd0ea2224345310dfbd10ca3 SHA-1: f1fe0c8364d56a61318ec3b1e14dadd2356d8262 SHA-256: 595b91bc5a26bb973bec5108d3192e875bde9284046918a368d99a56ec675d1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, many of which are disguised as download links for 'minecraft java edition'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a link farm, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=minecraft+java+edition+pe+download PDF link annotation
    • https://gotoko.com/cmsv2/upload/files/zosevimojesixase.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/98a7e5ead4ebc3fdd9f09e9279f42fb7/rejikesajenubikogud.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75235950600.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/84025215924.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/74006100169.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/11291142884.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/digatexuvotuv.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210903124839.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/wavifoxemoxejiv.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/vamadefokevubugosusabo.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/wosofufapupo.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/83394735139.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f527c2a7---vawuvit.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/junubalajenimeruruvi.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/kerakalufisekemevumi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vumepogatenesasiziso.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kv5b0gj66t8nuslmc3gs8pnaa5/bisebisun.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jonebapilojipejatojaf.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/9048487477.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vavuzevusawujami.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/98962611699.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139eabe52f35---42476800547.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/70462379394.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4ba8c742---xizipo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210902_085529.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/16296567806.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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 17556 bytes
SHA-256: 0f28d37162b7da22ce4881ad107e3a96005cea1cce8ad9f792d04af969dc9dd1
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10720 bytes
SHA-256: 5c643a0e1dcf4f54154c7ce5cb59092344c79cfa5ef76805cc8ede62924f4e5f

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