Malicious PDF — malware analysis report

Static analysis result for SHA-256 251072c674e7377d…

MALICIOUS

PDF

117.3 KB Created: 2021-07-12 22:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 322fa1925d7ab1efce621676156badf3 SHA-1: 03d8f6a4485dafc4adba2a95707fb0ae4b385c70 SHA-256: 251072c674e7377dd2131efee4f8c44f680ecb770d970369c2b89f8282a78e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host and distribute malicious content. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 https://allytemp.ru/uplcv?utm_term=cubits+to+feet PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bd1f35d4---46788406668.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/434825682.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/86de93113777a54a620e6002e0ea83dc/xunud.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9b1b3d15---gafelenejoxolabofodupik.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/wafulamobimusukum.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/15395947179.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f70l5jj4eiifvc4uv02t06qrvd/9960409872.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d1aa68df25---nabinolozowugeteve.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/23566809937.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/waxekopesuvifi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1d2bee740f36749380345dd0baca3829/kezafomuzavopasik.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e292d7de---pitukulenebufukiluwumarer.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0c8iv7chmk61d6n8st05h52mo8/lijipatuto.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/saziko.pdfIn PDF document text
    • http://mega.kz/media/upload/files/89384896058.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08381dae9---jaxevexex.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/maxafezopuginir.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b855aad5d36---40083832020.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f619005038---38820752157.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210608_058118A9BF701EE9.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b199fd67dcc77e618a732a158d5eec31/fibedosevuxu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984f47dbb1e---mixulij.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/togajutuxigani.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f16cafb---61166219610.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b3ad1b76170be92994e60a7ac5551461/zozapujekumorasarovulam.pdfIn PDF document text
    • 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_off00014ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACE 10064 bytes
SHA-256: a30551d622968325e113a875deba235d072b50abe3e9b36f29421e44642cc4a0
font_01_sfnt_off00016168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16168 16976 bytes
SHA-256: a357e7efea3a12d56f683f287bfdaa98fc4beab98c5ba6584243aa6e9f443fa4
font_02_sfnt_off00017a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001924b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1924B 21504 bytes
SHA-256: e209ae2a7cc61018d098e181045a49644205e790a3e6f4cfd81faefd3f0b1160

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