Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac02a73731d1d50…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 05:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ca32bed025859731052891e42765373 SHA-1: d12f5e991d12203eac1ee89784f42752f80e1c76 SHA-256: 4ac02a73731d1d50eca447a7ae311d1ea50d5e89d21ed728490eddc043ab9f87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and callback scams. It contains numerous links to external sites, many of which appear to be part of link farms or hosted on compromised CMS platforms. The document's structure and embedded URLs suggest an attempt to direct users to malicious content or services, likely for financial gain or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=communication+research+methods+pdf PDF link annotation
    • https://asoriofrio.org/ckfinder/userfiles/files/mekuvuxo.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/sozuv.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xiwerogozuluji.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wunel.pdfIn PDF document text
    • http://annabarons.com/files/files/77308826183.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/50f9948efcc2cb452eed74ee3e5dedc0/tezolexa.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/30490211321.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vovanakisumo.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/xexubu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/zanaru.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/zawekisi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/33084487671.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/76755739474.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wedajemowoloxozaka.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/sogapotosa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140be188b0e5---92046713331.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/31718691463.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/11014797422.pdfIn PDF document text
    • http://fxlcd.com/upload/file/60585275673.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/365e88f15fcc74c9588fb47fef6052cc/42469987874.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161378d8f9ab5b---36825702131.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/9144844640.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/sekefomulanof.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/nokisukopu.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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 16912 bytes
SHA-256: b3942997f60cc1e38b9658316f5b84f1a0477e6b637a234e2e58e7ba324feeb6
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10972 bytes
SHA-256: 503d1e9037a200afabd81e6378d968769f4478adb3080e5365cb2687368aa5a1

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