Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba55779e3066ab1…

MALICIOUS

PDF

89.7 KB Created: 2021-09-15 05:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7760f2a069fa8df32419c98c7242897 SHA-1: 09de872b6ab11852eccb3b2ab0d3e4d56e619e34 SHA-256: 8ba55779e3066ab10fdb55d25765cdd67362178adac53e1709c6cf6f7c045a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the compromised CMS upload link heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://synerhu.ru/uplcv?utm_term=pokemon+deluge+rpg+apk PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c2a01754f---wepeserosivojad.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/fovulekovebez.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/21223220698.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613829aa375ef---konagedivavajewo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8e4a2c863841da1a3a94ae0bc061d24a/nafafakazup.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/lukapazibugo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199086be1---62387175101.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0d0cc9c6---26482320664.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gafirol.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/37698765626.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/69399221197.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/3839426401.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/katazepibesuvolegov.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jalozinopitevakafetuwovu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630585225.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pezajagofi.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/kafen.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xunibudevogikosol.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/gorudem.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0049808d686222d4adbec6693a563e85/fofigidedemepufu.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/34963726727.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/satuvumewekibajesukeram.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/88233739539.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88591187719.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/93893410274.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/rupag.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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10568 bytes
SHA-256: ced77d92acabc031682269d8d92358969b5ab113c3366b7186917e5c3254f603
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 18652 bytes
SHA-256: 4674891c424881e8cd565bae099c3307642df130065f251a9e3397af7c495626

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