Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c132abdf43bcf0d…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 02:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18a2638980ab6d9c68dc45a5aa947c30 SHA-1: 01d7c39f8cd1b59c176b19b0c6fee49df7357615 SHA-256: 5c132abdf43bcf0d9553842302d8b66b98596f7b4520e596bcc4505751812046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610802d59d7c8---namolikesofatiniz.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2lb2gf6e9pv70gp3jpf4qufek3/romisiz.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/luroburuwuwegefarodixule.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pvpitvudltumkra72lc6jbki5j/fajabefaj.pdf
    • https://thucphamtruongxanh.com/Upload/files/xukazimaloxo.pdf
    • http://blackwingsexpress.com/upload/userfiles/files/74066812513.pdf
    • http://bioident.pl/photos_fck/file/63532653522.pdf
    • http://kapelski.pl/userfiles/file/sogenepomep.pdf
    • https://atkarisuli.hu/userfiles/file/tenasejaxuvomudinikiwa.pdf
    • http://apricomm.com/userData/board/file/nekotemokalusekuvugoxi.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d1eb8185ff9445bdac22438b0e75f8f8/51325598584.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0f8575530f813698edbd32511f33792d/56342941799.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3d4ea90bf1c596c93fc7fb2086cb21a8/52067965517.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c68592bf69b19d6b3e1e22aac6a66731/davuf.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707e962235a---zavesuvasisoda.pdf
    • http://fsoa.cn/userfiles/file/84047240148.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39961a0a4---15698697489.pdf
    • http://maychamsocda.vn/images/userfiles/file/fasel.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2fee778a---74630252088.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44bb1663e4---gujekivugavimamo.pdf
    • http://open.ua/uploads/ckeditor/files/20238258019.pdf
    • https://avgdesign.com/userfiles/file/30455365897.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d0575810---ragaxazibuwiri.pdf
    • https://autotrans911.com/thread/admin/uploads/file/31576653526.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210715_B968D86F68F0F730.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hogwarts+acceptance+letter+pdf
    • 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_off0000e410.bin
4acad932653fb024074206aec4876e58df0a83bb98bad6b93943a641b6d61032
pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 16972 bytes
font_01_sfnt_off0001107f.bin
bdfa51c9825888b5fa30f23e08575baa3f621da2fad4a7c14c3e71783d416c27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 10780 bytes
font_02_sfnt_off00012952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 16792 bytes