Malicious PDF — malware analysis report

Static analysis result for SHA-256 5043886eecdf6a70…

MALICIOUS

PDF

74.6 KB Created: 2021-06-10 20:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09c0f80ce248ec31e008ae12d6464642 SHA-1: 856d79964e47f0638eb83c1e74b4659c0e156ea2 SHA-256: 5043886eecdf6a70ae3b42b118450b09df797a4c654ed63945adb82e7b21ce2e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the presence of link farms on disposable hosting suggests an attempt to distribute traffic or obscure malicious destinations. The document's content appears to be obfuscated or corrupted, but the primary function is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=clash+of+clans+town+hall+lvl+7+base PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r6sbebc8uu4b87gufsm8q9njvs/23138301014.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/36329742394.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/55711865034.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cfcac31---betufupik.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/basutefexaru.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0a2b2b3770172d66c5426222452de0fe/degifumuso.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdbeb0800e---purinexugevopa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9g0atavqff5auv93a4bef53tt5/basomosu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160992043c2f18---69215874184.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/51743450137.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/15550596904.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4da0f9073303bc1b273a576dd6f716dc/29510968168.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8edbc8f---27667121361.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/18184229708.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_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 5148 bytes
SHA-256: 84a4dec11c521f7e149186f764e86579cc8db95ce9fa9759cffe707bcd388b71
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 11232 bytes
SHA-256: cdb43db7c074762dec4af97f0e4d4c74f3a7296a423f78006a341bc31ba9df0f

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