Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f3f98caa8a091e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 04:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d55c0a694576e5deda3c8ea2c388bb4c SHA-1: 531b5c85a92845d2b2e63bf04c7dc93500658d76 SHA-256: d0f3f98caa8a091eb9babc317321b08784d7d7381c14ed886f71a3cd000ca17e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the heuristic firings suggest the document's primary purpose is to act as a link farm, directing users to potentially malicious sites.

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://chcial.ru/uplcv?utm_term=body+temperature+chart+pdf PDF link annotation
    • http://lacasedescaraibes.fr/file/37109994662.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc6a76418---fodefomelasi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/89310905115.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/35554529396.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/kefobuxurasorejebupe.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rapajitovusunotafudesavu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/60893581685.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rjsp858vft4b7517ck4l8t71p6/sotefuren.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/60863589126.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8j1olcne1m1si48lt80tvgv6k1/xowad.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7a3b05ff4b608839dc87ef787f3743a4/xawamoduvu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611980b82b8fd---mowasevarozipig.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610910d6d0952---suwixafoxuwexaxedodol.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/64584451257.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5d4b8787---libavawusifufodetekuruk.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/19460850192.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/63567627513.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14122846e3---51701934982.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/81866305565.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af4fed362---tazubid.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vibavewakajozujupe.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a1131f7a---wenaxubujifag.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/75846109839.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/68531490174.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/75e0e3dbf9db7e769e74279c28ecdf03/ravelepomixunumupuxamu.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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 17972 bytes
SHA-256: 8015426010baf021910c5fcdd8e7cda7a1ef89943bf87ad9c81e76b672df9707
font_01_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 10744 bytes
SHA-256: 478965f3b0d54423f6ac0294ef889f55eb84a87ceae8bfa9b81933962e9e9065

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