Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf4c96333027657…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 01:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4768191b7ee64e14ee077f2d212b21b SHA-1: 5626b7fc702efb67d5b77eaafaa3c453685e35ff SHA-256: 4bf4c963330276572eb78fbae2627f780fb365b398891da8a7f7d90df0291d3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to phishing sites or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+do+i+move+my+contacts+from+one+phone+to+another PDF link annotation
    • http://apple888.vn/luutru/files/56189189900.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/demesizexeweluk.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/fitobigajiw.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/mafafoxuponabaropivoveg.pdfIn PDF document text
    • http://riversedgefm.com/files/file/31645060508.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d4202a3429e9279f49891651de78867/41169626449.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/87136055855.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/biwepexaref.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/zujipilofukal.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wawelotudekibuj.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109131732567765.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92b15ffc6---57151200270.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/mosixaza.pdfIn PDF document text
    • https://preciseenergygroup.com/media/71627754227.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/noxilebagoniwogotozimerar.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109041356124870.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92888893631.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c96c602da4c751200c0e5bbb039c4add/79023618671.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/zupem.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/durerobojabemasu.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/pavizosibaji.pdfIn PDF document text
    • http://dalaichau.com/files/jowezulizozuxodominemakib.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/34020308702.pdfIn PDF document text
    • https://ferropula.hr/files/kurivawi.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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16604 bytes
SHA-256: a9e18cc16439d81c1c746368fcb4b7cb83fb40f850d15b0f739b167bcb2da941
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 11096 bytes
SHA-256: d966fdb23891d099aa4346e2b1ff3959a92cfe901f65e47a44ebea9f0dacb643

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