Malicious PDF — malware analysis report

Static analysis result for SHA-256 09661aeebe832511…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 11:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdec9741557fb37adabbc130735ad99d SHA-1: d459b2fe69f7dc6f2fbadc2c580d8c474de7486f SHA-256: 09661aeebe832511bf2b0a087fbdfb4c8c86d67c7f6c61c903d2e650722f72a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains, suggests a phishing or redirection attack. The PDF document's structure and content, despite being heavily obfuscated, point towards an attempt to lure the user to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aptekarynek.pl/zdjecia/fck/file/janulutujirebetadide.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d452f7661533dc3b60e4d6d615c5b66c/gegupojemileduzofavub.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/bafugututo.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/64552550756.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zodevitadupefiti.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96037961458.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tezemumunenalavitolus.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109012008587048.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/51023299310.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/21889656.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/darararokupivokedefege.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/vemibiwelu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091417145980.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134171ec281f---7366710202.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/48113812040.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/pevejogosigogofedi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/juruxenataluv.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/42703596634.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/misuwusi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59c951550---86556797744.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59051425378.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/12488009805.pdfIn PDF document text
    • http://baove24h.info/upload/files/39191912107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=purple+and+white+makes+what+colorPDF 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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 11060 bytes
SHA-256: 49deae2b0fb1dfae217db92e70b93adaf4a0d67eed3377e67ddb594023f2b691
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 17712 bytes
SHA-256: 1aa86f7e3e2f069f73a49a4ea608672a9de24ca4ae6e00ff41438b722cd61521

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