Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b7ed5eb5d6f18a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 22:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eccf593cb836a1bfcc33ea0ca5956a55 SHA-1: fbdb9ccdcba38d529a85c8bdffec05849f347f2c SHA-256: e1b7ed5eb5d6f18a7a5e9716e02f31659693c304271350e86e47b15455e5782d
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://jpjplumbingandheating.com/FCKeditor/file/zididemobawagevulax.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pr6hha42lv2dfqhrh3gs94o960/vesosijofatuwevufemojabit.pdfIn PDF document text
    • https://bfull.ru/uploads/files/lonosaxekozaketunumiwig.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a2f3c24b---zolugumijom.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d1b0dbaf---28120229561.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd20830820---50437121291.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d41ef581---51275531968.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9t29kk04q3s87830q5dkripo0b/vedinorej.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716240ab20b---71217149692.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/50281772318.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93c760ab2---27403358007.pdfIn PDF document text
    • https://invest.pl/userfiles/file/29696915926.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/624bda2c122198425451e04ff60b1af8/38012750798.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/30ca5845b6d6c23ae77b91b851b45f46/55815378622.pdfIn PDF document text
    • http://kme-kme.cz/files/file/12285981985.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6c5c440e---fejawuzuwuvo.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/48304755469.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/kadonodonuvojixefutuxi.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0tsnnbbhlh96pbbbosvvgvk0fg/41516118865.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/87821446.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/lesuvupewogufapukat.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/863b2d23a797882010870dba725ab15b/49918546452.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/82912417318.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c2f453ddefb199d395a104cbfa52d2f3/8873777434.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/16158967723.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e5e6f888fc3019ca3c1385aae4a3bc5/52817507848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spiritual+direction+and+discernmentPDF 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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 17292 bytes
SHA-256: 68ed7c04d824a73a4a81f6b3e8536706ae30f7ea30d8b782bc43df1fee421e43
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 10848 bytes
SHA-256: f36cd34c49b063cde88100720fb9b1ddab961990858d1d2f8a0a3e3a8a7b7686
font_02_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1