Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dc7bd72a9e07ba…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 19:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: becef1efee0d1b3f6650ac120392c1e9 SHA-1: d4655f60f32f83bb4b197e07f4d78dbbf443eb85 SHA-256: 75dc7bd72a9e07babf7383d8e1a03da8626f6d3bac4218cc08335af36037d395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to entice users to click on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=stock+valuation+ratios+pdf PDF link annotation
    • https://brod-plovdiv.com/images/pofonaparelesovema.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8370ca6d7---92106262889.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/perutorukufi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/loxiwomaben.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944fec339e---53763006952.pdfIn PDF document text
    • https://upaspor.com/resimler/files/wunavowolo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b201b6c9---66094542613.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608445849fdf2---jitigukusufibatujowoduwu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e9005ac65---49056085054.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27032156503.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/614bd69ede9f588649410e4e30d89cdf/jugazupegadoviwinepe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7b706033d75b9ed2233b440e39e4ed88/lapaketebiw.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/xudixemubimupivimezowazew.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/4249084512.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1ccc942ec7030e52986d06a939b81750/jerogogokobewabim.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccef56ca6---tamorizepagafufazigesetuz.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/nufikaboxupewig.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/061ac2fe8c1946884df278d5baa24f14/benidanobitir.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/lotoxoposisubawodusewefej.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0b94cd4f---66679045808.pdfIn PDF document text
    • http://drironcat.com/images/file/23393013473.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/61033910450.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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 17696 bytes
SHA-256: 3f0d1a17241a42a6fe48d09d29c6291eaabcbe674aef60b635a438c27d2c8241
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10816 bytes
SHA-256: f96858741cf1aeaae2c5757f564402a82a534b35f3958e68a22a1105457cbe90
font_02_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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