Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b4d8251840ac04…

MALICIOUS

PDF

79.7 KB Created: 2021-07-15 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5c256faeb90b6410b811503df82b4fe SHA-1: 4a21f52a8b50883555d8bf2042e461030573c571 SHA-256: 03b4d8251840ac0443fcfa9e0c947af58dc263417de861b213c9ac60c892544e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d504b18---fepowalob.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/defa9ef882b0d1500bccb68305d764b9/jirolazawuwuvezulonazumi.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/34690202117.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061812531473499.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/11762523946.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/586e6e6ecbf132718cd88ad0f1959793/terinanumap.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/91945011852.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/de152447627e2ece482a8b08c43b9212/porixujurirumaj.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f909271b80f838e97cd96f5d3abbf9fe/57800982394.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bosuzixige.pdfIn PDF document text
    • https://aedwea.com/upload/foto/66222628728.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/motusip.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e061dc8321---gefafapekomipeliditel.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba2142b9f---94650347384.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/52020730840.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sh43sac8pu5478urfg0uovqmgf/wuzazotokefava.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/l39fb1047issakc29svb0vlmf0/59030110894.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/wexewupiwefejigitumu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9d239d21---84004438125.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e76dc3c3b5d19cd92c918fa7bbf06d2f/kigopitidodevabal.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/3252862173.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f842881c---41013584962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=taylor+swift+me+mp3+free+downloadPDF 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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 10992 bytes
SHA-256: af28246d0d39a65c002874e65cc84b8082eba1915591ecd1729a5119a02a248f
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 17540 bytes
SHA-256: c0c5e9d4ce444e58f786872223558e2c8314ebb3fc262c4d779638808ae51753
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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