Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19e4a069cec7af…

MALICIOUS

PDF

78.0 KB Created: 2021-07-23 20:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 83c820e6a7f1ee590dcf6c58b306044a SHA-1: c2c178a8533f10d9f2a70473306458780c1ff183 SHA-256: bb19e4a069cec7af33cd4e1a4b0d44b21f09ee91759f37647c7089bb354d918d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8ebbp34fb2874f7hepgqsl88pk/77437362451.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe7801a00c---pezipararakoxewe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/mh7751cmk7qciefc80pq4ue3mb/xuvizukotinawemaguxar.pdfIn PDF document text
    • http://lawngo.net/fckfiles/japigeripinidevasajofubo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/dagewetugoluz.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/37383691268.pdfIn PDF document text
    • http://innersolutions-uk.com/file/ropaxefaneropegos.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94d01daf6---xuxazatamulejiliz.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///fimabeberijumerikuwib.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/difadogotixuvujosezajuz.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/46333775638.pdfIn PDF document text
    • http://kiraat.org/resimler/files/34861761967.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/telunomixuwileximetis.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/41635747135.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1423f418a944a71839d0508f90c2ca7d/wokemudaruz.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf3c1d01b---xusodi.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedf7c749b---zexezolujije.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c48c9925c2c688bb09e4e1d96ca86b21/rovedavureduxusewilafi.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/62895369654.pdfIn PDF document text
    • http://axwelindia.com/uploads/ketilakirexifomuwemuni.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12ecd76f5a---megetubilo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6b102a6e2a6e2d5dd08f66125b5b6f4f/54621203293.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea45853ff---50016132354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pointage+antenne+canal+plus+afrique+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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 11040 bytes
SHA-256: 08cb2c17f44e8381cced8afd31ea125bf068a06259e25dd1fe03f2161edc7283
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 17416 bytes
SHA-256: 2f5421270c19286c70d92b061d14d1b696980f942d50a6e8ed968d58add2839d

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