Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c5e444f284a6a5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 04:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 909999e3ba1d3a5bc481cb8f83002985 SHA-1: 8f5605fc9c2e30ee7bb45f232ee53d79a5a0334c SHA-256: d4c5e444f284a6a50bf157b12515f19b27d85788f04ef54be7e976e296997aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites for further exploitation. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to facilitate malicious activity through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=examination+of+3rd+cranial+nerve PDF link annotation
    • https://red-adlay.com/upload/files/saxubot.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/68b9fc594d51fcc81cec1c1866777499/81494279753.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/72c7b5c3c67ea97ec53772d5fb31e6e3/lezazakuwepovuzevusemaz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fad13163a28e5bbc6558563d920ffddb/44477877512.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731d28c773e---42859372158.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/bemakujanopapatododon.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1594da8b8---rogumidur.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11eeccba4---60020211519.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tojowipe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092802e86c0e---46116125871.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2796f906a4---37657123922.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1aa43373---waguta.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/666a78e5c532192a92a38485c846cde0/bolelop.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ede7cabc5---58609108432.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8433a5c112---68183540899.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160839bc0b12c6---nodazabif.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/33707801320.pdfIn PDF document text
    • http://freeski.hu/freeski/file/sabupivaposumapato.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3vdhv0qt25kprdtqr680gki16/kumilitex.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zadokabonosobix.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nivomazamisekivusap.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9sllv73ff63in5nnqupskksqj4/26985856230.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/19753305438.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14dc68ffee---lubivudowizotezitorup.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3550a0880c---kerurebewogibajo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813455076c5---8319089654.pdfIn PDF document text
    • 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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10792 bytes
SHA-256: b9f275548337435a8868fac4649dd6630c0085fa26a90fb7d9a9f9ab098041b7
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16976 bytes
SHA-256: 642cb8a136297b6cfeafa7ef666a214cfc040496cf51f54c5cb764266279c301

Open this report in the interactive analyzer, or submit your own file for analysis.