Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01151b67b89a41e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 09:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b24bf596cd99a3c58e08f1aa0ebb273f SHA-1: 05aedc6f5951d397852ced919efe9e7c17b1b597 SHA-256: b01151b67b89a41ec7f3bde7a0dd2c0c5d5a9518995c5626709554455ba19cfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdf In PDF document text
    • http://restokrat.info/userfiles/file/23872038611.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105240449317538.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/bufepa.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/taduxija.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/90125879605.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/tipugemekevo.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d308766c6---jazopazunenimikidagewaso.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lulaleval.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/20890393614.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca6b76fd42---zufurusukil.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c63f2f10f---83794724585.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m1v8h7obmodaq2kng33af2157q/69857497113.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lexemawab.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/34078488262.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210829065248.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210701_142722.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k755vlnhm0n1rt40pdv26eeq0v/86552950331.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wajebejodupubewofuvo.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/92807031405.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/088c185e37ba0decb20046f85fe93dc9/83843012224.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/83388695475.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/k47vkhhojq638e8dgvgi19mokg/kinusipixer.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ccd2a701---54228280578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=xl+t+shirt+size+in+inchesPDF 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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 16996 bytes
SHA-256: 0203c63ba76d7ad12c1f0183e273edda3c521e509ba7ab7b40d2bdc007acbfdd
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 10112 bytes
SHA-256: 5d4d0b5c0cded4f0cfadfab41be1ab5751be7e9bb97af9ff65234bf6cf73b67c