Malicious PDF — malware analysis report

Static analysis result for SHA-256 84480721a8b1da6c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 11:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7013bdc737533d29e94187762e060a44 SHA-1: 9a8cda0326a7ad96dd189abe5176a9cf23ff94a3 SHA-256: 84480721a8b1da6c5059d95543b300fce691fbd88d928863862bd813e1160e92
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shtaket46.ru/page_edit/_samples/userfiles/files/vowibubezezejifimufob.pdf In PDF document text
    • http://domainecomps.com/documents/files/fasakopoligetujagunomuda.pdfIn PDF document text
    • https://eslms.com/userfiles/file/fusopugumexamag.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/lerelanifexumej.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/vopotegiteg.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/73629056717.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rejizabumij.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/zisonaguzuzo.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folavuji.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/70464927127.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/julatizipolemorariware.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sj1ki6ulgat4j91h6549u3j4f3/78222063508.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gegukovozusagiwuxerewotez.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kubitirujodanogejidak.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/jofapusa.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/psvbq4v4au2ili57iaavd1p2d3/68815195521.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/65571747081.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/25202562821.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161333d3da6c9e---guzadobunukinuvosoxovejud.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/99626595769.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/09dfd36d7c0eeb38203f095884adce36/52171526847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=padmavati+full+movie+480pPDF link annotation
    • 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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10864 bytes
SHA-256: c70309f5718e6760b7b94a44108456c48d6440eff3bb9a5255d51c76abe583b4
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18872 bytes
SHA-256: b2e73b61aa4b858abec44fb39df2d7ac5fbb41de25671aff3ffb34a2aeb70914
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1