Malicious PDF — malware analysis report

Static analysis result for SHA-256 48454bf447e3157a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 07:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f993d6830feb29dc99dc1ed4e4ad5c4 SHA-1: ebea56402506c04c2e1ab7cb98e3dfd4936ab2d7 SHA-256: 48454bf447e3157a5f8963c302a1ccb110c2f57e69c653705ae4e7822838fb8a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.iciparis.ru/ckfinder/userfiles/files/13261679828.pdf In PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/fesikuk.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/sizetuvegurodifomurepuwan.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/35aa8aa2065915d0ff3b7a578c191f38/57118552052.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lofiju.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cnn4po8vis21hnge2o4ft1sfgq/61660935871.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/febogopuvojodopibom.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/91537685175.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/21394742338.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/32797064283.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gupaxexajelew.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962db807be2---lefidobefulukuvoraba.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/13452868027.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159abd5257---midajinirituvixixivoba.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zemabolepe.pdfIn PDF document text
    • https://bem-sa.com/img/file/17417388501.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9996519f---10315005641.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/83951590873.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f17fc0f34---60909558402.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/7148894958.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296f389f1a0---miwirowerelopalawosov.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/vopoku.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483496aa67---sowewofenik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=streamlabs+chatbot+custom+commandsPDF 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_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 10856 bytes
SHA-256: f17ec6e55d377474da026ab9d8270d3bfeb71df2d566d06ba723cfc4e4fd5198
font_01_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16824 bytes
SHA-256: 883728010e48d63f871e6d82bafd3fcc256959052b4234b21457e7504020d316
font_02_sfnt_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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