Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0515c40a7102a8…

MALICIOUS

PDF

98.0 KB Created: 2021-08-06 04:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07df142904aa4175253a1b6e152aef99 SHA-1: 7adbb0f252c97062afefb507a8923f56a943cd1f SHA-256: 3b0515c40a7102a8531076eec8de8e7db4890a04d44cb0e90472923c06ad22cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://villa-carlshorst.de/sites/default/files/file/baruvudolegadizij.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cce10299---sizanogutikifokulomenu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7a810eee6895e3abd6f6c4eb99e10a52/66362123439.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130bf80b61---buxexifagedogerabilolele.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/15142635033.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d864510---82639861148.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765ef0e62ce---84269511638.pdfIn PDF document text
    • http://fxmeat.com/upload/file/53cd7eda27030356b69bfd16f8e6cd03.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fezenulame.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/19933705874.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/193d6c3edb253edddc9a8c34ef9ecbdd/65329490149.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/71591325954.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b226ab6d3a8---doluzinikerelewe.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/69510908643.pdfIn PDF document text
    • https://vleek.com/uploads/files/sakogagirifovulupow.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/92150269161.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/noxujosupifaza.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1029c889---saxemalimolapopiteniki.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/99759319064.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/jazolagugawopadi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/96e6f9035e25552428f26ccd4394e251/lepoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=le+mariage+de+figaro+r%C3%A9sum%C3%A9+court+simplePDF 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_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 11068 bytes
SHA-256: ee3f84f3924983c9a688d9593e4f1e0e3523acfd916045e7b370749b93623f51
font_02_sfnt_off000146c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C2 19312 bytes
SHA-256: 4a23f9639ab40c6729663c0e0569e5449f71d7cb0abd1097da608c088d708813

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