Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d3d9c2d15c8bc1…

MALICIOUS

PDF

97.9 KB Created: 2021-09-06 02:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbd37a29dae295b9d3f3a7464ad28e80 SHA-1: ef57952017470a0263de9a934ce64e135d399567 SHA-256: b2d3d9c2d15c8bc11efc4adb81acd69a093bb7dbb6a4770646d22e82275ab581
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 WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bc9de93e---51617900733.pdf In PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tukofomulirunixepakelez.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec9c4c0eb---27443515155.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290816206894.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fc724b90c---69395829076.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/zikalolasukogifazabepafez.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/19813f2bcf3f5788eb7543a5f1cb42ba/99036843693.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/xuwetowanekawetosapujelu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h90i4on0l7ru4pfah4u0h71lls/23253021257.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/209092dc04d54f4cede216b8fab19ceb/lamokatamizigowunuge.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/39910092654.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3b65606e---sibokulimoxewixeledep.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/57531130426.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c102baca5---71625783459.pdfIn PDF document text
    • http://ativn.com/upload/file/razeniwewedametaz.pdfIn PDF document text
    • http://stylekd.ru/files/dokurapabajineleg.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/77392797914.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/wepebuvaxel.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/s4sdh2v3na5bnghfk4ok2jk5me/fiwerobotifube.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nipodojej.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128f0354751d---51019903101.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1d6c7c939434433d72fe271dd34daa25/bifurufosejomataz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212b65ed7---40329177349.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210601164521318.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086173d40b0c---kafamogubopavedemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=exercices+corrig%C3%A9s+tension+%C3%A9lectrique+4%C3%A8me+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_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 22428 bytes
SHA-256: 332e8986a24b9bf2fec4ca4f78208e98e2923b1d99832c5488b3e9257db94e4e
font_01_sfnt_off00014534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 11520 bytes
SHA-256: 508a74151809504884b1019592e01c39c8770598adc1121388c979ffd224ee28
font_02_sfnt_off00015f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1