Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc21aa1faf16f67…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 05:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14117630261042a3847e813a43115d6a SHA-1: e818579f8b7fea9d89acd95390e0b08c3c55b5da SHA-256: 5fc21aa1faf16f6773448d0348ec97e531a0ca873ed7b59cb6ef2e854193a87a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or leading users to phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=how+to+do+exponents+in+word
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ad515c56---43123145649.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912c534f67---gigifizoxulurokikujote.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ed48d005---16761650133.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fd27580bf961026bdf27734c8d9b850a/nagum.pdf
    • http://geometramaurotozzi.it/userfiles/files/56937603003.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/946bff3ac648c0ee63af04ad9ed2e336/11735912706.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0eb4a0mgihnh7nda7t1vkah4t6/45190113584.pdf
    • http://ahlhy.com/uploads/file/300622314682.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d285d29ea---turupevufajowijiwarelugun.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/dbe1195327813fc7cb5116df42a2365e/59671910136.pdf
    • http://akkoryazilim.com/userfiles/file/70908676681.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/juvumeba.pdf
    • http://tutek.eu/userfiles/file/6632769704.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba0588d5d---16013265467.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qhldcm8c4r0esvqe5mug2inm70/zazubewozekaxux.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ed7509287521f79d6a7ae33a98ac8c47/46229850226.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc0212534---ragomoxawofujo.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091a095b3177---vetekejumotikusuroxef.pdf
    • http://abwplazaview.com/uploads/files/7244090765.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xokitegexujagakibemexirig.pdf
    • http://ajivikafinance.com/userfiles/file/68479705688.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_off0000f097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 16792 bytes
font_01_sfnt_off000108ae.bin
5631d0ce1045edeab71031ba16f1e059ac96fc50889011e51f051efc5331fc18
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 10356 bytes
font_02_sfnt_off00012032.bin
fd0b97b3c43c7a4cc3b0d4a468e7fce2a2f7fb379c8dcc02e816b1b3e4b3ae2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 18304 bytes