Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ff5deb850deaef…

MALICIOUS

PDF

125.4 KB Created: 2021-06-15 15:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5d3ae27933c30a4ba82f9c5269650444 SHA-1: 931974cfdf91853513ccceaaf0434b40882ec0ce SHA-256: 18ff5deb850deaef067e6a38ae17e66d275b79e5c98106f478417fc93bb9ea01
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=yugioh+sevens+watch PDF link annotation
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc24d65c0---bofunazazajusa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9ffde5b4ed67adbd3751968ee038aa73/84395940621.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b5fb01e42ac912b65a5507881624e433/91321183234.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6ae33e2e---89668247112.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b48a26f25---23672655536.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021050214331854.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3757d0ac---91968750883.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/84983929741.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070973c02b5b---wazoridazexo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qlr0sb635qne6ir875a2m4vps3/bamagibiro.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/wolebowoxe.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/snk6im8m8io1732923s115lgcq/pefugasuneluliwu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026d6034b6---9438864330.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/79129076354.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t597vq6is4hv7ptl1dbcom92pt/zubovevetajumanuses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ee7f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE7F 56172 bytes
SHA-256: 460eaac00a3457da4cf0fadd13a50c4ea03e6eeb9e2d33cbf586afbad20001f7
font_01_sfnt_off00019a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A07 5044 bytes
SHA-256: 446da5b4759d4ec3797a0a58a6d089408154decea14699d7d759de6cefbdf707
font_02_sfnt_off0001ab51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB51 11332 bytes
SHA-256: 619d70ddb169340e27ad77d8cc6ffa0ece5aa3d580d9455ae6e58afd66c1311e
font_03_sfnt_off0001d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D116 16308 bytes
SHA-256: 17d7c7252f696127aeadd11f8e6956b742fcc98cbfc2c26b7d2c25622f92892a

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