Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf901571c6da4852…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 16:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3fd122f14ee26c48590bb8192d70c9e SHA-1: 0be1f63702255116a0d017bba886e88fce0c4d45 SHA-256: cf901571c6da48522ff192a43312b141856e3d6f0eace728c57e090c5496eb68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naplesredeals.com/userfiles/files/jukimivikekuro.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/10420671615.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608f087d86f9a---fipajipugoxiravuto.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/mavopada.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18aa7ec29---valizidejane.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3e3764af0---jujoxov.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/62566964311.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/52798950310.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a337c478849---kalekoralimulimegu.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/norodogexuranala.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9cbed55fc72a8417bbaf5b6caeda132a/wuwela.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/togem.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zukuz.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2064c0085---44100473485.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/xomaj.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/50848270863.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/57504061902.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fagivulomufojimipaj.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/19671990185.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba165a8a2---76959047057.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/84730024250.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/37936882999.pdfIn PDF document text
    • https://businesslife.com/content/file/60680217486.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/mokuziroji.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc10089bab---32306081879.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/33931098709.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/96290314553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=concept+for+art+galleryPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 10540 bytes
SHA-256: f16b71a95c28b3c97740c68108ffa59c24294bcab45cbff51a3541c83eedab9b
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 17732 bytes
SHA-256: 6cee98c430ca716e5c90fc0f358551d18555a50e5c412f30a256c672744bc085
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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