Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff309f12151b2b15…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 06:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10bdd0b93606af73ac2bc48c7b4c84da SHA-1: 9d2f5de5d832cc0753a2391af5a04a83062e64fc SHA-256: ff309f12151b2b15c27686eccb3cc2e04c6079f26d659acdde7fec8d4e23e0dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/95796121150.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0f8vjfotqcd8cop77ishtqc0pm/44547797678.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160748f0876019---voruluridewi.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/teladeg.pdfIn PDF document text
    • http://standdominica.org/files/files/kabegubazizes.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0317f63e53ced0e46168f99e0880d6a7/38998216256.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dorabe.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c0fddde9be9044a62ef3f0ec2b1cd9bf/wimematuzol.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/85603821cc28ae9796fbfecc1d067688/kafapil.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/18402563978.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a314c0777f1b9d18ab8a5d75caf29aea/71306150292.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/8216203094.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5fceea3b---vagitovifumokogo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376aacf3a4---13030022060.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2de2fb79---18161868123.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35b4f78af0---33788885388.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/sotoj.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/28834742686.pdfIn PDF document text
    • http://huntland.hu/upload/file/dinoxoxutuluj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779c9dac4f8---23967817569.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061615545940.pdfIn PDF document text
    • https://airshow-bg.com/file/64131986791.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2b6a062s7h3nos94jpg0l7c63t/32997776140.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/zozotorixadenisawawore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ao+smith+electric+water+heater+instruction+manualPDF 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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17908 bytes
SHA-256: 0cac0cbf99b0ab3f7fdf91ca5abcce6b65dd7defe3375f58015c54a67bc8ad77
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10660 bytes
SHA-256: eab799506d1c3787507fa61aa1ef5923eaa4ef4514e6f1e0f9f90280ec7e03da
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1