Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88c4e5de502e0d4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a9627703fd074faf54907ac620557a6 SHA-1: cc1e2337bdf493505e5996cd7d8ffaee14315459 SHA-256: b88c4e5de502e0d455d8dd6f86ed34da7d57190a320bc48815fe8c30fdc63dc1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infinivideo.hu/sites/infinivideo/files/20386748257.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf27c19cd3---kalodofevozupopof.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3ajhnscdick20648ksbv7bgbls/47945694959.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/774dd0ed406898bba990f99be824257b/70613528181.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/woxopevimopujukeda.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67babc1a7d---81861312143.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6o01nk2rrpu6mrqgeksi0og6t0/52110215100.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/83290222937.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/seriguvidituvon.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a6c84248c506c3bacd121f7ec0a80912/modevipix.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3f1a2101---44306804263.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/86878016506.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/16/file/20210716_011630_116.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/73963399478.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/15954610268.pdfIn PDF document text
    • http://altinay-law.com/images/file/mutarimeredepebizofom.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dac6b4a5ce9808c6a0d54a201e0d4615/49445352073.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lesusoworawogegenizidujel.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/dapafoda.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084528be5a97---64287067120.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/71921926200.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tomepojoduxawegasimes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=problem+solving+procedure+pdfPDF 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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 17932 bytes
SHA-256: e8e10e5fa08c7be08b866bb3f59071018bcaa2a4a5ca8eb072492693e956b5c6
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 11008 bytes
SHA-256: c08187d6c247e0a5bdefdb54c747f61b9590bb2df15a6eb357e59d1c871a7465

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