Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dfe22fb2c27d97…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 01:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7041ec974b12ac0367500925d709cc57 SHA-1: 1c6ff446facd15e5b339dfb9a6e9e6b6cd3a8ad8 SHA-256: 48dfe22fb2c27d9708fcac0275d33744fe5b64bb999e37c8e5fd9d30550dc2b7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of link farms on disposable hosting further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=starbucks+barista+aroma+grande+coffee+maker+manual PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5ial7l5s6c177u365ke2o1l05/19487329011.pdfIn PDF document text
    • http://spiregene.com/image/files/20210721_185010.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fipefixedirobip.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/43422915440.pdfIn PDF document text
    • http://szwygs.com/upload/pejudelametiva.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/90582900258.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a64d15ff---77770421257.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b2e8174d---loxukaxexi.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/gupekijolax.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u5md4pj8ucfftlabs6av8o6adm/farikeworujoloro.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cead593b743e80f64d29841a48c36f96/kojepin.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/21549408299.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/29750804108.pdfIn PDF document text
    • https://binhvi.com/upload/files/ronemikowova.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b098ec34---wabariseminegukonuta.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/manexukukuz.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/68176166097.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jumilu.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/69426829777.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/97897016160.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/39002566943.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/f1d756636f16faac5678a7093ffb1145.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/kejunudodopanekama.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e42d2c75af0150da5e5337f74879378a/14057035682.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/64733748538.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d3199a7b2485b1474360a82b5f00f329/59375393265.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e94777a2f---miratovututibolunurux.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17596 bytes
SHA-256: 98fc6a077c8bd5c4cd57c846c3a7b54bf14cc7b9303d3a714cc6ed5b4a958d44
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 11228 bytes
SHA-256: c447d335aad5f9688e840b978f819a95903cbc09b298a962ad9c1b0cd23656b7

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