Malicious PDF — malware analysis report

Static analysis result for SHA-256 e432178b10c1fa7c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 11:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f9032087b01df7080f5cb2bf4449c3e SHA-1: d773bd809d4d2f4047450a0f850dca0a4d748af0 SHA-256: e432178b10c1fa7cfdf4b6d9f8ff8b5b472e8eb349fe7f899969e68d496cbdc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The primary goal appears to be directing users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=strong+smell+of+urine+meaning PDF link annotation
    • http://asesorgubernamental.com/images/file/penadibu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c215d2d1b---69615452110.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/75014666289.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/45630691382.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/vogefedusuzolagan.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/82531f214c62cb400f87424860c5e7ff/kedoweseguvaj.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/17188859254.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/nazigafewikunilawunafoja.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54675e439---rugazetin.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/42923894469.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/86400290624.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nubulavukevuvopiv.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160836371472d3---33021121723.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/27d5d4a74c236d6584876e433f1b18a8/11289641559.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ab02163b---28511110366.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9240f61274d3aaabe201baad84c74c8/86677762437.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/36517066104.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12f2dd2f0d9454f6929579e13d51388d/67041435977.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/92776765661.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/32845650800.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160debfe6ecc80---tiwitivirud.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/12698698687.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fb8ccb536---61561588102.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/livizebuxikugilewuzunumo.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/jovimopomosogoninipovem.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/35780969750.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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10732 bytes
SHA-256: b94119b06590421359df6a84cf5138ceaa14d495bc1f558e7637998420562334
font_02_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 17300 bytes
SHA-256: f41e065ff7153fc1b9cb2da7aa599139b79d7f3bec48177330952ec8bbb36320

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