Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00de5ca4bb4a790…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 09:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a845ceeefe032f981da135e1a646d840 SHA-1: 873a77cf559d1849c522ce40910e7ee8d4d0abf6 SHA-256: b00de5ca4bb4a7900101ab6387ef6b540b877ede474c88ec4732aac8be5ca3ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=reheating+brisket+in+oven PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160876d8544997---pobuzonitubadaw.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108290029213218.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0ef1ca971bb2314ffb99a7edc9866302/36823677604.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a34c27d0f2afb4fc7d160ed48efa98f7/kotube.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/60015861591.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71c4acc55---mukoripawosew.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5577ecfdf3725fd3766183b398c95d82/zizotebawivafaxiwuv.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zivuma.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/fevidawatepapapok.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/40eiucdluguhvoqm2aktjcob29/28802947700.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210708215356.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nvdfbcsbst7sf3brcr30mustk1/66662984123.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d4233d25---80539263103.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/91142311535.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k09kmp2t335ve3eou69bumgoa6/25523258013.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b770b02ac0---pokerutifokareveramire.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c130306049c---zexibunusuzak.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc36d6cb0d---5676605779.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/jinarajuponuwujamowa.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210608032839.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/pozozonamatutijus.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e63dc7b04a---murokisilowolomowebuxejix.pdfPDF link annotation
    • http://kimhoatra.vn/upload/fckimagesfile/41588911013.pdfIn PDF document text
    • http://topas.lt/userfiles/file/xejulokubozafuwu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab1be8f9---jedinowimugigipuxebonus.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/gajiz.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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 10684 bytes
SHA-256: 4bc3677e88e59e6a4d4f25185f49afce96e6e65b7a03aa69fee5a81844e3dca4
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16408 bytes
SHA-256: ac72d00ed8a0b9cc4222084bda0fd00eb90282176c99907f0475db8b5cfa6df9
font_02_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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