Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8b14d7e349d9c7…

MALICIOUS

PDF

78.9 KB Created: 2021-06-16 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c9bb7dd66063bc99bf6e340e819ca4a1 SHA-1: e1c67f6c10c3753396afb44c8e15982f694d6cc2 SHA-256: 5d8b14d7e349d9c7e35bf6c6d9c94055f10a80ec4f3309cf9068f6e10c420cf6
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to "Windows 10 education product key generator", a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=windows+10+education+product+key+generator PDF link annotation
    • http://arohitourandtravels.com/userfiles/file/65713138041.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/13075126684.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lipile.pdfIn PDF document text
    • https://pindimana.in/uploads/file/tugajinerolut.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/vukisokutox.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/p8rc2ofqkksegf1vbov8u6dklc/puzomuvifiger.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bepubu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210513031342.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16097503ecb752---sabuzijekena.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c3e62ee---sifimutixotiwadoxaz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4e46421e0e480b1e71f1606a67db439e/rapeveworiwozur.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c5359afc4da423626ba86d824984bd24/91227290108.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f82e3e2f8---gozetomolowifi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd13ad4d46---88837862662.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h59n4e5ick5thr2aqft5hq9bv6/gajufaluku.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/69948456656.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/88svbgmhovko96ghv77bdb0454/33295055225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 5676 bytes
SHA-256: 68c7ff48ba8c955ca6377eb96659f1d1d31f1547067206ea1da40adb3ddd06f8
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 11204 bytes
SHA-256: f53ee145e7f876308cdb48aca9d65ce50e7b8293264f89b54b3e442d18b53414