Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe62990cfb65208b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21c2cfaf8244dd8aa3d31681c9c84a19 SHA-1: 520f5a6ef3bc81247e04b3f7ed1adbeb84f77788 SHA-256: fe62990cfb65208b8621fa8acabdada3bdaa40ceb8801fefbefee4a38d7d5a8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://shreenatharcade.com/userfiles/file/loxaxedalefugijomanawexub.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82c034e81---jijiwejowomejesox.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/89542064296.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bedesilenalorixetu.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/tivat.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/pupogubomogoso.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/petegedemokitiwijezux.pdfIn PDF document text
    • https://unaizahic.com/Files/files/60080376979.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/parifebufemomatapaw.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/pozosodinebopoworurenuno.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/80361862229.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613378e8e25e2---33187349518.pdfIn PDF document text
    • http://polletnv.be/uploads/files/fevajarek.pdfIn PDF document text
    • http://mayjack.com/upload/files/5481480198.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/rumajojediz.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/16897713741.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210906214650886.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc8c8e65d---79966123961.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/niwizowusutizepomisef.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/xiviratesafifos.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/xiferi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e13c5d4e9---71908859469.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jalotogusibu.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/wavefojotokuledesatitezuw.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jikopevexuvisaj.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/xavizikajimivaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=into+the+dead+2+hack+apk+android+1PDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10612 bytes
SHA-256: cb8be40fd7a22afb119a30fe68471f198b8f7f4d2e0d86c49628f5d60e8fc752
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 17284 bytes
SHA-256: f1eb581194c9c842b27f7bcb935b4c2b1ba1e94e1737db5b014d283c6635ba46
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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