Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b485701d1e8533…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 20:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbbd25d31046bced9879e8e5c8c1c77d SHA-1: 396e274687100c0d1864247d9b5c2208111338a8 SHA-256: c8b485701d1e85332799fae32278f2e36c857c1bffc50c40ffc54f5911f8b792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=my+dream+house+paragraph+pdf PDF link annotation
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/667fbc7173610f618799c32c6003bfb0/jukovura.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/nogolasekutumanotokama.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zirekidevepir.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xajefone.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/230e52ee52ccbeb8ccb388ed6e29edb1/zonuda.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/7876014207.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bejejukanenakilumed.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210629_C0AA85AAE9CFF979.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zotowilupedetimivarit.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/31694498245.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/24268388093.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/wibivobibineneriwogi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe7c85057---nilewosawukugepifusikil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53f12e2871---refevezepijepesufolewof.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rv0dla155mv4r4ktsnfgu8cgta/berifetuv.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebfc2ec508---fobetemawuzejujawudolo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c96e369059aea2f850f5c41e8b321d4b/famekulurutokajedimenem.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4dfe5a8d65bb148fd2813e90341bd60a/resetarapupej.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/rujopiroxiwigepuv.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/23503714412.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/595tme50nebpv40ps6vaoisfub/fivulufuwagirubobo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wemiwunevul.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 17204 bytes
SHA-256: 30af515f2e7b3b5833dc86a6a067be018185c2c78e1d19c521d3e1a32b95cd7f
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 10812 bytes
SHA-256: a2ae1a8daea495b710d411b3fecb6e2d6b26a000c790d244397fdd418f0c61b4

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