Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256c14088a77bc5…

MALICIOUS

PDF

75.0 KB Created: 2021-08-30 06:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9325efee0a9ec4c0e731c1ad7f05d09a SHA-1: 77c4a20887c00941d8a8a59e92793409098b82d9 SHA-256: 6256c14088a77bc531b02bd59bde950c678297b79ff0e5c5b310513a7d4f8ed3
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 CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tamcl5mui8ujfln0b5njbkuha9/53131023493.pdf In PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/34645475542.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/97181271378.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/26499769657.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32bb7fe90---66754257484.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/62362904653.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/43148890626.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbd885ba31---46392316673.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/14343963444.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lalapizewegivuvep.pdfIn PDF document text
    • https://seikai.jp/free_images/files/lusupumojovodoguwe.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/24485114678.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e25d7a83---17684049073.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/62773701645.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/98796208480.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160994823a8f09---61962644110.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e33faa4e9240d8d66d485ef4edda7ee8/kesafipeluxagi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e24b7bb15---tolivigewaserirugiruja.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c09fa8ebbdbc4705f3aaf7292d8a9cd1/luzamu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1j09g1c0e90vto7rap4trii0lh/riwamekavobematakoriwusel.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc565c00432---2062092347.pdfIn PDF document text
    • http://quaint-house.com/xazujopakiguli.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b513a27d5---zisexejewiwitupevekim.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/70620864383.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/66591349130.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/35082244761174bdb2d6d6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=baby+mama+song+download+mp3PDF 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 10880 bytes
SHA-256: 563f4ab9393093b18b0955bd75e7450eefcea40cb818abb5c2969602aca03dc1
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 17716 bytes
SHA-256: ddbe9139b48d9b686a5abec7be4c634f2351c5f3d0bca1de7fd3425de2471304
font_02_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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