Malicious PDF — malware analysis report

Static analysis result for SHA-256 648fa07860f8a3c3…

MALICIOUS

PDF

134.3 KB Created: 2021-06-09 12:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bce2e013be66978b802b5adf7bdd7c97 SHA-1: 4fb683cc4b04e086f20c1276a09989ad2a8cc24d SHA-256: 648fa07860f8a3c32ead9740e14bbca0803aaa9e1e3ea5cfd68ea75efc3c1b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=geeta+saar+pdf+download PDF link annotation
    • http://ingmontagna.com/userfiles/files/webozuxudemigibara.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zalazazikube.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab12e320f---23803515566.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pl4d9nbk89cl2hq676pph3a580/3353889679.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083018799d56---tagutinuvupozodake.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0q0lp0olrb211t1rh765itdd3g/15945382541.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zotogef.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c714cb107e9dc4c0ed4d4f683aeadfb7/22711474104.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/liva3b2t26kca521m4t7rb2s49/sokolosasobuwavumemiko.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/muwefibukabudusilotepu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4a4occ394lvrbgp94ve285n4tu/geboxofemabala.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352ebd3241---61014213713.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf087971e7---59471613439.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/walekapajitiruxapibag.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/55e6a9053da66fdd4f7b4a41ee5e72cf/2146365296.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/94d304b51262b0e4b6e3f92095f210bb/ramifiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18188 7836 bytes
SHA-256: 8c94d47ee7bf673327c2d9c6bf86789523ea23c856e2076a02a9934f4203068c
font_01_sfnt_off00019bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BEF 5160 bytes
SHA-256: f31c045c56e8cdc1ee58021b1cc9adfd2eaa0e9fdcddf4a7f601fb29c08e4d1b
font_02_sfnt_off0001ada2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA2 12404 bytes
SHA-256: a41c86ebdd31ea4acab27735b86f874076e53a136b0e9bb8f99a2a2371e9243f
font_03_sfnt_off0001d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6DB 18200 bytes
SHA-256: caa38581264569422876bc54e2d90852dc732c14f5db0229ca97f1567ce9bc81
font_04_sfnt_off0001f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3AA 6872 bytes
SHA-256: 91c884ddb18d0e2878905482128385584c6f0c8e13b9d6efcc96a805ae8caa2e

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