Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef08c58b0932e0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f354ada1ed77e4e14dec374aa3688553 SHA-1: c6c8a29c0befaec4883b392142f46d9831ab1199 SHA-256: 31ef08c58b0932e0d5715670c758e1e94bfc02885ddb22b7bfbe024f80755f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://biogenetixpharma.com/ci/userfiles/files/4959404525.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1fe55abb38b0d553d5d2cf54bec597f/97326454075.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/4140917900.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/50306094214.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/magediwipowepituwulibik.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/webewu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312733ad2ad---66843702031.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/jiruv.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/47623255251.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/kinuton.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/gemuzegoletolulozawidapaw.pdfIn PDF document text
    • http://firegallery.ru/img/upload/53649937817.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/rodugomos.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/rizevenopinebi.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/28686330379.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xupasapukobidenidef.pdfIn PDF document text
    • http://gysanya.com/upload/file/210901231225494077knoe9vuiua4r.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/12636976333.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fovubinupuxa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4258483f1---19875119058.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/39385135661.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/tobewej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=drayano+pokemon+hacksPDF 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 16468 bytes
SHA-256: a25406a223bb658fa8f3e62638af508206557167ec7f07892d49ed6142c38ee2
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 10608 bytes
SHA-256: 362296327a06938e0db3596aa94febeb90793f51e924832b711ea3131b902330