Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec0acb8c497a15a…

MALICIOUS

PDF

89.3 KB Created: 2021-08-01 00:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a72814c946019a7193a0666b2fbddf7b SHA-1: be6b046b618f1f564dc809badad1478814c31ce0 SHA-256: 5ec0acb8c497a15abee35692ecfd7b24f1453f79d82e5eece309db3547c5b3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics suggest the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jncs.kr/page_data/file/20210703204819.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7e47052f0c24ee31cc1ea8d9adc435bd/pexax.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/18618864395.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02e8efcf4---53775328083.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tp1rv6ruobqq8ms0dkirlgbqhp/darabag.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sajuxofajipipinubu.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/pesusono.pdfIn PDF document text
    • http://imi.vc/upload/files/32654716007.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/bobamojapujenizizevita.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/mirijexisejoxavofug.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0fb4ce0d58aa845d9b8694bba81762e4/88895318516.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/totowatipofozuxova.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kowigariwetukenoripe.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6dd0085695f8aacf1b4191983f5920fc/83128103722.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/68045452301.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kinajofurelejiz.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/fumagogamefemosidifakenor.pdfIn PDF document text
    • https://digireg.cn/upload/69038543690.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608640c60f038---87725400235.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3ad156957954ad88c2755a9a74b9b517/54757519612.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/wibuza.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3ef40173b38b7a844fae1608ce784132/zulofemokesupololo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/65098994127.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/risokaziloxanorubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+take+weight+off+cricket+batPDF 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_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 10608 bytes
SHA-256: 16cafd72b6a4b923455b269fa501cdec45d48a5166c82c93c07c0d10230d8d9f
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 17172 bytes
SHA-256: 5404043f1549cd75047d5e7de8dd881589b969d9a10861c267c21d5597274350

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