Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2be767dab0fa57f…

MALICIOUS

PDF

80.5 KB Created: 2021-08-21 18:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf4078c7b60162d4e9cc5089823639eb SHA-1: 888865349a5ec72fe99a42e5870a5407ff051328 SHA-256: a2be767dab0fa57ffcb05856ac6325780dec75cefa89bae61b87a9253f61d5ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://khaskhaan.mn/uploads/userfiles/files/nogabazipoxuzewutetubadu.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cda7ffd1d7c303975771865e962b976e/bovuvaxevegetukomoj.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15959e191a---kuwarexonodedigener.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607489e76f3e9---84374268143.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/mafarefafeparurefujofa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdad6ec95f---xizubovas.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/66025057503.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/34857235561.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab958ae8f89---39719691385.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/357980cd69f883a4bbe88275ea53bd84/voberogukizirukilofatagu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/506b52b1e24afc10d6007c28cc4ac7fd/tidivif.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/zowizejowepawovepuraxines.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/dapodux.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://contelex.it/userfiles/files/70238585207.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/92074824156.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea435111---vuwetitibom.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/33898476166.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9eddbc517---mebozepudagulukutedon.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vurux.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/60240023914.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ef7urn6g76rjnubflaim1ccgoj/kimutixutolibeva.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/jobawupokabofijawexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tmm+engineering+sdn+bhdPDF 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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 17788 bytes
SHA-256: 7cafb97da1c01416818712f79633966942498198cd00a7ccaf9b2827b46c7b2f
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10372 bytes
SHA-256: 23700368f492212e464820cd6d08990bf814f4d99409150fbcb4f3e66e6f55c8

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