Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7b35187323ee67…

MALICIOUS

PDF

74.3 KB Created: 2021-06-15 19:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b032c7fd723dfba814d5eff546f543bd SHA-1: 4c8af7ea32efd902f099b234a1a243d5e92aac22 SHA-256: 0c7b35187323ee67a904497f8c23e6b5a53362a153b2299a82150f1e883995b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize disposable domains, indicating a link farm designed for SEO manipulation and phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily corrupted, contains a reference to downloading Fortnite, suggesting a lure to trick users into clicking malicious links.

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://laborke.ru/uplcv?utm_term=how+to+download+fortnite+on+your+phone PDF link annotation
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/cqag8kodkmk955r991oaom4jgu/nawonusipituzanizeromose.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a2a65021e0df95f32d13ddf6fb7579d5/jaboruf.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde7c00897---25228759500.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/047qmkujig5slm2974aqaf2ls4/wufetexug.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/79558750384.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0764c509---88947998620.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/dcd199ba6c9c9b69ae250385b95fc7e5/divufekapegefominedug.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/56988022428.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g5gbmvosni0ca6rjgajs9ndht6/fagopigulema.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/36932415682.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd753e705---5135627415.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/kosufixorigewuwulun.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714abab7064---rakeresagejeduxupo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2t0tfij6pduih1d18fier9oq2u/12389826411.pdfIn PDF document text
    • http://rld-carbon.ru/file/kijexidetirowakiso.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5104 bytes
SHA-256: f22012d52fc501503f2e5dd61e10d0d03170744d97a0a876af7452795f6e7234
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10892 bytes
SHA-256: 55bf6830301d4ff28210e30d2174b328c18583f4bbf90630c347df8b8fc4bca8