Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aecf30b741655e…

MALICIOUS

PDF

105.7 KB Created: 2021-09-06 04:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bf527a41a38314cf51d6bae31073485 SHA-1: 290be7ece67ddee3bf6a3d37b2471a4507d347f9 SHA-256: a4aecf30b741655e1b99ca01780f86082c586ba05b2ad1f62ecd24b0a0edf139
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm for malicious redirection. ClamAV detection and ML classification confirm its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/304df083c5b8bd74366793bb6dfe6da1/gewunufojunawerolilafa.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gh922ce9csvd0g1imshncqtt7c/89882094001.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/70575242159.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/52883602582.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/sowepotudi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/333b328bb003fda396ae41ce466028da/gixafoju.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084126344295---60739697554.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a359a17aa65---16151754626.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zatanisote.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae83a60ed8---livubagorunexuvomupowogeg.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tuxufirogenego.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/tcm5b9k706npac8qqhbdh8tfcf/zetozevu.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/47335530270.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160fc78513fff3---vivexopadatono.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/rafuxulon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be94420ce05---wirufaperorolojusa.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/36c9962430b3c3f9b91cf1b3c99a54c9/fulumugareraragowevigimak.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jcb3jd3kjugmrspm09ge5fpucg/19671635855.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/97445198089.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/11b78b2682b1df72b9d7213c1ca58e79/warugupuroro.pdfIn PDF document text
    • http://kaies.net/upfiles/file/nomusolero.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/nivizazarod.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/5300089275.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/704c473cc09e39926c710a4c445e55b1/16452996420.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/voposadavotasir.pdfIn PDF document text
    • http://naucseto.cz/storage/nugafevego.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/86dab732b5289fc7b3b9439d15f17a13/75346989401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sql+server+2000+stored+procedure+programming+pdfPDF 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_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14896 11592 bytes
SHA-256: f972fdd1d91f85118298b6988f039a7c1bfdef261f44025682fcd750ab3287e5
font_02_sfnt_off000163a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A6 19996 bytes
SHA-256: 6715b957e55f5451ef306c24eeeebeb7689fda7cb3ca79f1d0c91730b7595573

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