Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8a790861ee8f53…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 02:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f643e35c32856e26f91882f3c0d3e465 SHA-1: f8030b1b301ca93c184ffcadc24debdac090ec8d SHA-256: ba8a790861ee8f53201e9dc9455e8374452c78a1a4f671d4602e06dacff2f285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://glaze-metalart.com/upload/files/99233844044.pdf In PDF document text
    • http://vnos.vn/app/webroot/uploads/files/46922897081.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/63538591834.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xotewigisetuponuzekoti.pdfIn PDF document text
    • https://irantruck.ir/data/file/xulemafefijuwadugimeru.pdfIn PDF document text
    • https://e-midas.ro/files/file/dewejubojedurufajafegoj.pdfIn PDF document text
    • https://el-tall.pl/pics/file/65570914206.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/nemezuzoxutugurudukuw.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/67145958097.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/21005472614.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/nomusig.pdfIn PDF document text
    • http://popeyebio.com/upload/files/gareforisifuzozifise.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/milibonoxope.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/66201611990.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/30687676033.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec794272---lelojimosanenazopibuw.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/35307478999.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/gejabadureloxirubudaxufu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/desim.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ac77562b3b5095285ba8270036734d2b/42264088618.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f148013a96---sofaxuwuvetes.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gapakumuxikotoxerofatig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+volume+lowPDF 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_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10216 bytes
SHA-256: 21894144ec6088e4aefd75f82fd08fee111e46a3183a8c9c30edd00325e9b447
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 18792 bytes
SHA-256: fe4eaa4e13dd3d7da28a382e27abae47963b97e99a11aea069380ad75c91a8f1
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1