Malicious PDF — malware analysis report

Static analysis result for SHA-256 be40767acd755913…

MALICIOUS

PDF

95.8 KB Created: 2021-08-07 15:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b089c1ffb1d09360a310d618b899c028 SHA-1: 1766c2086ee3e1ebdfc0b0a1eb7ccf62605c9d15 SHA-256: be40767acd7559132fc28e6ba07494827e5d162d3fded32d7cb93e15e23ae9b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to various external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://curry-box-deluxe.de/userfiles/file/55576773881.pdf In PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/27989016356.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/35626185387.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/xepovuwagefufureb.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/30781178028.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/6279582013.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/84048606661.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/54864255144.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/sozivo.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/27074862891.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceefe9d4ee---biguwixitabopazalajifa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6c65ef0ce775abbebff54a7741354302/rogepu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080223b93c67---tagujevemavepamige.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/pekituda.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102928f952ba---48180535252.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/35611425138.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/1376996131.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/57300507188.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dde1c958---kagaxumolet.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/85820113635.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zogipulixizazuzefin.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/3597721232.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/64345382403.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/57524434387.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/85598678614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=samsung+galaxy+grand+prime+sm-g530h+pricePDF 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_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 17648 bytes
SHA-256: e8d32ace71e0a103b9ee2d59641ea817166eedf7e9f06e04ba45e316ca0120f3
font_01_sfnt_off00013db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 11596 bytes
SHA-256: 4d9b0558fedc7b8515f35d21867adc1f0a752047a417cedce9d1eb9f3137f88f
font_02_sfnt_off000158e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1