Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcda91198a129547…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 17:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecf04458337d1d92d0bbdc214da65803 SHA-1: 1c062b4c183918ed0db3fa69f6e9b638e54325ca SHA-256: fcda91198a129547b84d9eeb2963a673c950192e1b567ffeb63557251b7ccb8e
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 compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cardolf.ro/files/89362910187.pdf In PDF document text
    • http://opsir.eu/files/file/razututixusobevu.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/ledotuvipax.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/supem.pdfIn PDF document text
    • http://midel.me/userfiles/file/71972622374.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dusamivudesumuf.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/84522558849.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/89605126208.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/3888024013.pdfIn PDF document text
    • https://pkbae.rs/files/28520158573.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/5533242275.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/48960459509.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/polujakefodiwaletidi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/52405081546.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/37084092884.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e3ab890488bcb56302a4bba82a96ce3b/rowexeburuwevidivifamifu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/66272224132.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xevofu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rasifenapolejisafubi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4d67ee15---gomepamaxivinudumolabezoz.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/dawaxusazuxobuvi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161434b92c8422---53074028297.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b52d80203---86210687325.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493029c6391---gigotazotujuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=robux+calc+new+free+downloadPDF 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_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 17896 bytes
SHA-256: 59f91eb7b52b47c3a21c73f6b90d22b5a513e13e25704f8e60698a755abc6294
font_01_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 10584 bytes
SHA-256: 7c6d016b69476d53154b8670d72a734abca1e25f419e1fb4576e3a342cef0dd3