Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae93e3123f1a6e3…

MALICIOUS

PDF

77.6 KB Created: 2021-07-19 04:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c1c1dfac784f92a2a11f7395e88ce17 SHA-1: a6b3c0a7cdbb1d3375144e727a29bc47b631dd75 SHA-256: 0ae93e3123f1a6e3f259bd4195ec070d62726f7bbf497f7229e19f334e5643b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. This pattern is indicative of a phishing or malware distribution campaign, where the document itself serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unesco-mediain.cz/fckfiles/file/xaxuvudogorenor.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f10d9cef428e5f4d4c10be70affca860/22144910321.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aaf07d73f517c629f62e458c1b9728eb/95586644790.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/linav.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/lopavijufugadu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e3d0a05a8---94643394970.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/55673160196.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/oprlggtho2rcglammc7sge1la3/tijunotofofivifisepe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbec430e---83601320525.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3d246d7f3618bda05b2fc26f80220ae6/55948973478.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/14234669843.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a291346d03d---zumafod.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/sivejonafusi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/39613530452.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tkj131ilhbrghaepfs91bnl8lt/mezovovipidopamozotan.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/24053311401.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/topebamagileloj.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5j86c6h8tkf2n0jbn34muh512/24573979895.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/veloxolasalupe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/85f598bee163e5ea24c12338c6bf919c/rumumivise.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/naduguzonobexizeraxa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9nlem93tcofpfn8khpbodrk927/puwakibebivonoxaf.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/werojes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=city+of+patterson+recreationPDF 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_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 16216 bytes
SHA-256: ae1e977356ef7df941ae17d90cdcebe1a06381dc0529ccc4b300303fa16b3325
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10572 bytes
SHA-256: df52034d14a04b1cb9dfdbf52924ac3204821aff72f89a77b454812a527d0612
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1