Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e818e5d7a14913…

MALICIOUS

PDF

83.3 KB Created: 2021-08-17 08:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 234d65ad0a604d32b8677b7054835df6 SHA-1: 89bbe0944593fdcd3ccc84fbd0b5d5c2f8632d5b SHA-256: f1e818e5d7a14913ead82f33257f17642a1773519145c4c6db0f63e10f67d647
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=cuentos+cortos+para+ni%C3%B1os+de+primer+grado+de+primaria+para+imprimir PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f529d7e59c34dee0d99b49b769242a90/nufavubefoka.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/99828138705.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-30/20210730195332432020.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8a83ed061b8ca229d2eeaf849cc187c0/58880945236.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/7167566230.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080d24393c5a---84851210461.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16114c6fdaaaf5---69794966801.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954aee3598---84845926503.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/69816155476.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/77192953261.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8678d9e4---sezuvofonazired.pdfIn PDF document text
    • https://sharenkon.com/files/45661474489.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/285a4cd8af6cdbc28a23b6aa9913d1d8/67812096764.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rekovu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/72120286113.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zebasiwopu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/16983171135.pdfIn PDF document text
    • https://afayl.com/userfiles/file/13899182366.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zozugorom.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece255aaea---21033671152.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d41bacb7e---13079551271.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fbtp355tja4i5428h9hdc93jb2/bexujugopo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/95155826989.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/65152713136.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 11148 bytes
SHA-256: 3d0f4a31575ce4e6861869f3d577479f4445fefb4eb343c92642bfa824b976f0
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 17572 bytes
SHA-256: ab3e3f987973695e91ea64ddca340db984028197fcd221c016242b5d41189f88

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