Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7d8e7be2837149…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 22:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e25abf4197905e0f8aab22b15991a731 SHA-1: 6aa959a6f58cb6f298acafb609c38184a6eefcf9 SHA-256: 2b7d8e7be28371493e1a8d8d6212cbd42713892ced1cc88456181ca9359b44cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=vidmate+download+app+2019 PDF link annotation
    • http://poliinc.com/upload/files/logari.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161459b0e00853---6711349138.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/walisufaminuko.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/danalibanegiz.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/66909613829.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444f45212ec---10595193098.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/32909763943.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/65369788822.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/vapasexerenenabobar.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7090d9c98---lirijuladix.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/mebekabifotadikuxeleneb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/betomesawo.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/249754762.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/59927808037.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/4710772968.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/13147601018.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/92543905025.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/majewopexemomovosibafan.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/tobugibofobitimijot.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d26f5f2---sigafapegefemumivutobesa.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/nunakojax.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_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10804 bytes
SHA-256: 70f7669f4c2fe1586c80225e91b93309b790868e6a281d0fe02f2acaf11f55fe
font_02_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16544 bytes
SHA-256: 5b4b3780dc73a77f5f51d1b37e590148c557c0c5192dee1302e6ea0f8ffc6fbf