Malicious PDF — malware analysis report

Static analysis result for SHA-256 67775ca95cf26060…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83785f53a87252a01478ba74e5faaf0a SHA-1: b1f026d8adf5f6443780e8eb61f2d7c86c06715f SHA-256: 67775ca95cf26060f6cbc64b16d033f47dc52268f45de946e263b1040fbb8d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538ddbad4b9---tunotoj.pdf In PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/60302482182.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210925_185022.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520c788137c---10815660067.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/rulirita.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/zijasewidesalefodun.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/sulosibumavovu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/midodiwutoxeketexofas.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210922032625.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613775f772eda---bavedujin.pdfIn PDF document text
    • http://ccsl.asia/files/gujoveponukose.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109120703083706.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5428fa3c---nunuxawa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/56e6fe345cdc691366ca7ffa3550ad86/suxefipafawopovazul.pdfIn PDF document text
    • https://birudongker.com/contents/files/rogab.pdfIn PDF document text
    • http://hibertek.com/image/files/20210924_103028.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nuwawagubusuto.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/59310473088.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/98134649083.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nokunineko.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/83008687484.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f37ee283fe68d28b8e7dce9560f05e84/15784579513.pdfIn PDF document text
    • https://begili.com/uploads/image/files/17977190703.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pipize.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajom.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kutasijigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gesture+unlock+androidPDF 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 16676 bytes
SHA-256: 12b33e120a5325f06888476722203e0432b2795e23e57272c3893f69367a73e9
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 10596 bytes
SHA-256: 930e880fd98fb12760f6633ac97dd2e449c448f3fd7d8e77fdacc5030fcccbe4
font_02_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1