Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefa51ea3a38ea69…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 08:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c03e59e6b2213c4ac9bee6097a9c9609 SHA-1: 2c171d040f88bba318e93f43e0b4ae8bff79108a SHA-256: cefa51ea3a38ea693c281fc0d0ac1bb37ab40e2857479ad83f527de48a4e2fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://onecre.com/images/content/files/48382407292.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mizokij.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/ruwewerabawanifib.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/xukamareku.pdfIn PDF document text
    • https://aromamarketing.md/img/files/jitarakajaradekugawar.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/nulan.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613882a5040f7---vogewakukajoveki.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbe5adc34---78212475207.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/55923273951.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/molij.pdfIn PDF document text
    • http://sdes.in/uploads/23620338256.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/xepomepuwazugumum.pdfIn PDF document text
    • http://agrion.org/upload/fichier/kexudilutaroruj.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109012007389381571pdkrfgts5f5.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/95692713594.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912bb26b47---foredetetadudolam.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090900119533.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/faxalobepezexazen.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/1919182221.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/lokaxodadumumagokokoriwi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/17336740773.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/60490293813.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109131024139230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=auto+call+recording+in+motorola+one+fusion+plusPDF 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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 17272 bytes
SHA-256: a93308d04988bebc433e188955525882c88dc1ae1677376bac3ab83ff471d26b
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11044 bytes
SHA-256: 0d549917ed5cacfff382faa180b289fa9bf4d662d32929d338904574148195c3