Malicious PDF — malware analysis report

Static analysis result for SHA-256 390d4b11f2428ad4…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 06:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7142116a795950bdad13bde9686e503a SHA-1: d37531effc890e32a93e780b9bc44c13cc972dfd SHA-256: 390d4b11f2428ad4ca69cceb6ac3a9ac1b3869e647000f1afbae76e368aeefec
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://izumrud38.com/ckfinder/userfiles/files/27682436616.pdf In PDF document text
    • http://indel.sk/userfiles/file/vazatuxapepiraxoleribosi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7dbcb119c401c720c4884aa463db8e85/zakanabumiwakusew.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c851c1abf08bbf093c696e1c411970d9/pazojagobosuzodejifo.pdfIn PDF document text
    • http://cpils.com/userfiles/file/97437068135.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l9hmtlsk923pcnhg5u23ig81j4/pisofokukiw.pdfIn PDF document text
    • http://ahchala.com/img/file/fonojetenix.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1f961f82ceee4769e415a1c33e0f180a/wabib.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/68086302768.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/wavodoguxumu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vusoxifawezefigofe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c20f22a8---fanunij.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8a2cd33bd6dc741190525926f2eca929/86920530881.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e36017bee---zabisisamudulavevel.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1e18d7ecc---53848352061.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/xokij.pdfIn PDF document text
    • http://grabnerestriche.at/vumot.pdfIn PDF document text
    • http://camonetinternational.com/files/file/69680635634.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/saximekozomi.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/38010460185.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a4r2e3o57hn6kfhd5u2tpjbrvr/kexoxiridamozete.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/270ed502da89e0fd130e2e4584a212d1/69968240114.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kevasajixu.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/28704226847.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/881f42043861cdc36189bf41b2435cee/fozug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=condition+parameter+in+jclPDF 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_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 17612 bytes
SHA-256: 323527c5932e4119a73b0812fe133875063fa7a758a4cc1fbc8da87ca930950d
font_02_sfnt_off000158db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DB 10668 bytes
SHA-256: 8817b7d309f02764e52cb3bd447c437324337037ab15fff107937091c1972f27

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