Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35721e1605f0fc7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 00:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08e6370c40eb9962dac5dc6053468f24 SHA-1: 38024a9b967170a66dfd1c1ea0a06e23cc721ad6 SHA-256: e35721e1605f0fc7bbdb0360b8af907780bcf2bdbda383a5d5bdf787ea76882d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a fraudulent number for support or to resolve a fake billing issue. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised CMS upload directories suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8044d64e66---94973571271.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc6d35873f---sogavisomupereweganano.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sarijenonefijuv.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tokomutatiwewixekus.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/pigiduwarewewire.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4vr52bnc5mu1kab3trqq1r8hg5/22458078095.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaacb250ad---66933511381.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/tasujidujibuma.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/24719938492.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837c27e8633---pugadibukorugir.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4eaae9b7---litirito.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/wixovakatasedugenifexali.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210529112128537.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/18940498684.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/kowokapamirazimotuzi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a293552d1c9---79448349181.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/pimosavozikusodos.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/balotuzanafadoru.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33016481593.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/56858738156.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/243d095a9d033dd7bf940d641d7dcf89/nivazibu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/17/file/nuzamazizug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=systems+of+equations+elimination+word+problems+worksheetPDF 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 11516 bytes
SHA-256: 7789248d2e89092d2b15ab040585b03d4f9c1889223803db5443c412c4b403f8
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 17828 bytes
SHA-256: c0abe7163591b56d72b743cbb7b22d78f92be10d748c6d4f0999f01b94d22dc7

Open this report in the interactive analyzer, or submit your own file for analysis.