Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba2bda104a8a1c7…

MALICIOUS

PDF

77.2 KB Created: 2021-06-27 21:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e86b34c260056ca21c6916e05c58000 SHA-1: b198520762d26c5e1a4165ad324ddb8575e56e3e SHA-256: aba2bda104a8a1c7b277e18c6f639764f1f3961503e79072b8e1bb940e727a51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac5072358---ritatuvu.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ivkev0p1soulsvvhav550487gd/14580824857.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40fff127f---90674033723.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/gusexeritujedabitat.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/10118676596.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f08e381efaaec9d808d8b1e3b61759b/ripadebaruxovug.pdfIn PDF document text
    • http://shosholoza.de/file/nonejo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e37e010f6---32579381800.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/boc37phifbsse7fpoci33r37d5/88463121901.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bukidisojerazikis.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c659d2e307dbd2f9af10ef63b127d8cc/sebesobi.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/fizuvu.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/moraxopadelokozajakaf.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/dakikifatuzize.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/vimoduteriralitonutoner.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23ed81060---64144647546.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a095888819417f07c374123f061cb7ac/vunivofilotaruxisunavezog.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jidawekotavatavananiva.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bda7421bc44c5835e4eeecfde7ec8bd/59711588654.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7b88d946---sugitazuk.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c017d85a70f---32931598067.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7c611c9a1f073cdc0f7738e0cf412fa5/9051486692.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/10421618923.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/panawokuxotarosotunobuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jquery+hover+toggle+classPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 8268 bytes
SHA-256: 3718f63a13dacd71d0268cf0c217e59a0b722bd41ef77ed858b7a0327a5c5f58
font_01_sfnt_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 14708 bytes
SHA-256: 73df65085ae7e9ebe4ee2602cb516f953e1cc14cb216dc005d592873403f0d5e
font_03_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10728 bytes
SHA-256: d4247482272ecb17942fa0aa3725fd380e3f07178d7b6a5cbd062340be83a9c6