Malicious PDF — malware analysis report

Static analysis result for SHA-256 3649963e31f4c313…

MALICIOUS

PDF

108.6 KB Created: 2021-07-04 11:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 459b374bca4fbb683b0b2fc03c8e4fdc SHA-1: 216320a1f2464963eb29714274b585d09198f32b SHA-256: 3649963e31f4c3132bc2250eb5fa042f29a0a15783cb2d2080d7f3ba8e5d1249
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f6ce0c55---sevepasow.pdf
    • http://pronobile.de/catalog/file/soposafelasaxafutuzuwut.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b778c33199e---38331222797.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/sizaninoradaxuzozokupijur.pdf
    • http://micronforgacsolo.hu/UserFiles/file/29023824706.pdf
    • http://alliance-ltd.com/userfiles/71412707557.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/miwedokexegaj.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/54028866389.pdf
    • http://dj-venci.com/uploads/pages/files/mazupebadositezi.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/55bdd995ba6363ead15d0af95fb9a46d/33561691035.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e864cdb37a22e5cffe16d00ea192f0e6/41517448615.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913c98a12ba---33973785647.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1666b9c27d---99951973105.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a74f7b079---42900060950.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/doolfnde838utenblvmf1a3g42/79282923882.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/nuzisoluboruxibi.pdf
    • https://proxus.nl/file/bepusekeset.pdf
    • http://sosnovgeo.ru/userfiles/file/giferuguzigopofubaxa.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609822f3d5ccf---xirobobebedinaw.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7292115d---vumefidilisizuvenepifob.pdf
    • https://transit-connection.com/userfiles/files/jufewupemig.pdf
    • http://tajesink.com/Uploadfiles/files/penukuminigiwil.pdf
    • http://homenet-spb.ru/userfiles/file/nebufapunirusaxitizuzikor.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7458b57c---16393439101.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=core+connections+algebra+1+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145b9.bin
180921650f4eb7b072bbcab915a4b0e7b979009d84cd38de7f7b5ef0bac4d977
pdf-font-stream PDF embedded font (sfnt) at offset 0x145B9 17612 bytes
font_01_sfnt_off00017418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17418 16792 bytes
font_02_sfnt_off00018c2f.bin
8afaa5928dbe091581e9ce014cdb2f8fcd8c83bd963451242f7dac2f5a729651
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2F 10712 bytes