Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43c51c58599ed8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 07:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88400dcde37263cc5747a56dd67f6bc0 SHA-1: a66a3709d40ef9516e9bd45ee131213047acef30 SHA-256: 3c43c51c58599ed8bc7a8b24ff9f3ee0d80675acb056d155bfb1472ca9fb3954
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=fpdf+write+html+to+pdf PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7b63d08b1bed0d5e5e1e4638482bdc4d/36004859492.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987465d7937---bipeniduropopoge.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/52971067435.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160facf6ed9895---zujatozelanibosalorat.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/28641243933.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zavajes.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/befeniwagesagemusut.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825b8f32b94---97501315904.pdfIn PDF document text
    • https://badrivishal.com/media/nisulavonavodofapaxalemo.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/72709657845.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/webisisifa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71c169f3e---piwiterobadu.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/81141678698.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/fb66e1d0ebd39b51679749a05e0713bf/kojugiwub.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/36790821474.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/itghugpjq7st6a5caoqq17ossn/6989906734.pdfIn PDF document text
    • https://resicolor.com/upload/files/33667277427.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eee4e89f74d304f985864dd499ec95b0/21512030325.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609842503de42---44839494594.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/bomatuwupekuvexuf.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/kisepaxilebofevedaze.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/jinuruxawapikafizo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a5cae76081015e9668251ac25cab9c9b/91676494494.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077392ad7785---lisodozawoduxiw.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 10392 bytes
SHA-256: 8c7ae6515c11ffc57d37f52ee35f8e90d958f81b592a998c442b2fda2277c1cb
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 21068 bytes
SHA-256: 5eb3b9393c526b640229d2d743971211a599f52889bce61085b92f711bd3308a
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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