Malicious PDF — malware analysis report

Static analysis result for SHA-256 788f3da109027f80…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 01:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 310f817c67c023f4d9449b4d0439b899 SHA-1: 802788130bf7bcb2d69ced5927f3ee523d8fd77f SHA-256: 788f3da109027f805f73cf19998b7678316883daee441d7df434e8440c95dcaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of a 'download button' lure and numerous links to potentially compromised or disposable hosting sites suggests an attempt to trick the user into downloading a secondary malicious file. No scripts were extracted, but the overall structure points to a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///22333635748.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc3cc0f6a---33118381591.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/bapenipidinaxozavevitegof.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bujemerogezumeseli.pdfIn PDF document text
    • https://12shio2.com/contents/files/lifafedijo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/79193650253.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/dovofojomumotanulanagapiw.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56134620329.pdfIn PDF document text
    • http://firegallery.ru/img/upload/pinepomapubapozezafije.pdfIn PDF document text
    • https://remini.hu/userfiles/file/ruwiwemowofofid.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/26174686302.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110630553415.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/movoga.pdfIn PDF document text
    • http://ymmicro.com/files/files/75412277548.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/67852029926.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/ritipaginovovari.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2f12ee8d---44441613105.pdfIn PDF document text
    • http://getem.pl/files/file/mipalosusi.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zupevidegimeropalediwov.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/81010503149.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29c9b7437---45528506967.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/77170884983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ios+live+wallpaper+for+androidPDF 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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 10496 bytes
SHA-256: 68411a0c1383a5015432a73fb14528a1c3ca1b5e71b58ffa8cf33b65973d3212
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 18080 bytes
SHA-256: 959c04d193fe5648cf87c7fd782f3b020ae670cc6e63a0000a03b2c2e15535cb

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