Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1344222feb1dbf…

MALICIOUS

PDF

94.7 KB Created: 2021-07-08 12:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f82ee08e35346db3148b533bf7ad1474 SHA-1: 6f7132f13a1f28f7c7bb1b7e2237890bcd3148e1 SHA-256: 9e1344222feb1dbf2507d700ee26c41e434415b680fa0a44e4ebbcbb8c4e5dd3
196 Risk Score

Malware Insights

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

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into installing malware or revealing credentials. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. The document also functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, likely to distribute further payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://whiteplacard.com/UserFiles/file/87051056831.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ec6111510ba34c5313c9db01a14d4949/60738632493.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b70c8137492ee841b519cd2af6dcd96c/90785953558.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vobewikifovugarik.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0pp1isjf8fmd5njjhobfdfri5m/xazaxakedotanekakoxudul.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/pazudanapoxekekujova.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/siwesar.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e3331894---7008805649.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c793fc20eaa---47481082499.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ebf64a9c---bopimiv.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/52388680184.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/sewoxemageperet.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa963820a4---17899086057.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa53134cf---lotop.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/ribovikizozamudowalagetaz.pdfIn PDF document text
    • https://airbays.com/userfiles/file/wowoxofexasilanarebodu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/redoremibumofapexu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/67770350152.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd97998fd2---kimozo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dozijenaviguvow.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/av7deh0dui3b42uslva41p8ka7/51580991462.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b76dd70b---98520973611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=online+course+registration+system+project+in+php+documentation+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 17652 bytes
SHA-256: 51714ff06e1f28a507f088498e5f1ff75863a3f440dffba4e7475e78a52fad9c
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 11436 bytes
SHA-256: 9688d460731edb01ee9d5098870d03ed8fb3c3697c5c6fbdffa7d5a45dc29d74
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 17524 bytes
SHA-256: a66527840bcfc2a699f4cdde99da2296ab95871654e36025e6b7f7eaca467213
font_03_sfnt_off00015424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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