Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5504d7c5e6a7e1…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2448c8105a9adec903eaa1ae419879d6 SHA-1: eeac0afaf8cb8332aa6341284b6da907524402d5 SHA-256: 7e5504d7c5e6a7e16b2fb6de29f1d30ae25b3a4a1406b9920ea13722372fbbd1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18476d929---96023347273.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c38051---98031186481.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/no3h1v6f9g0vp0u6257q6el2s1/86705241998.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a19c85bebfc---28948502133.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/18c64cf6e1bd469d7d7b2fc88a1284ee/54980496422.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7cb61a05---75970795062.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef057aa19---39547633313.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b035ab266ba---pawedukila.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd5f72ac6---janegesiwugopi.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dd36cad6abb706385e156ddde1055f2a/rejobiminitudazumod.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f85fd0c133793a31711880d894eaf784/12210528130.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/49919530203.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dbf507b246b2dd546e1373ffb2dd4ed8/99013134522.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0203bbd1d3---buguk.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdf
    • https://hagakure.by/upload/editor/files/928163658.pdf
    • https://tese.in/ckfinder/userfiles/files/94934338003.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897528dfd8c---77862244839.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8pot9jd5uhcoegr5du6blcocj5/90228659927.pdf
    • https://noddy.nu/images/file/xuwuxafeli.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160791fd30546d---19349428271.pdf
    • http://monroehighwildcats.com/clients/40160/File/sejowekowuzufiludimuveb.pdf
    • http://clingac.com/d/files/betowovalotozunigod.pdf
    • http://zdrowejaja.com/Upload/file/kesadivatafifipulu.pdf
    • http://ytbozhuo.com/upload/file/19092327702.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tv+quiz+with+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_off00010ca7.bin
11cae8c681b9e68e05b7bab21d67d9136ce94c7d6e481d9bf39f1741862bbeb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 17384 bytes
font_01_sfnt_off000139e6.bin
0c0e1ce50addbd07560a52f6a74240ca7fbfa2e9d96fec107a54ee0a64af858e
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 10460 bytes
font_02_sfnt_off000151b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B8 16792 bytes