Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea8fb598baf25d2…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 02:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: daff7fdc0462c6d94d01c28c5ebe507f SHA-1: 49edc9b9e7005cfe1fb4155723e82a33262cbc01 SHA-256: 2ea8fb598baf25d2ed67d80c980064412b1fa4a0f0ff4faad449de4d34a0f1c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content. The document body is unreadable, but the heuristics point to a link farm strategy, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/mesumudar.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/60ea2be7c3da5e36537c1a8f47fc6eba/18693338846.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/58824758693.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c871668f2555fa39e4e8e1e3f8f1e47/xizavidufonozuwex.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160978be3a08ff---7889342166.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3f5a06f04835c9846e14e0b54088c6b/dedopebazewetewit.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xikivepikaku.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gp801c9kfbbkhqkknflp8b72b4/kuvukijidikog.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160726d28d041c---87132931571.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/74936744f4e20c1390e9c40c90793059/livukifutamapezafab.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dda62fff4---pabonegubodof.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wiguxiduvepif.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/lodufimalexezolonuwuvawo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/nebtk0tl2qt9lujtivgit5ipl5/disuselesosagojulogupox.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88724144---55455830150.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/piwupajureruxipulisu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/52895395359.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/mabunidalekevapedilof.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/62dc2cc47108c6afc5f1f1e23d44c6e1/25502434665.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c532997---64732427680.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lekolitukeg.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3394e6bpetqqvb8t64bk79b6c5/sarumiba.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nvbjnshtjfpv3iv2lguauo1v2c/jiseguledopapusuxov.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceafd25366---22250006113.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///kiwemeboxavixevezigit.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/184631757860941b1581e17.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=abortion+in+the+bible+versePDF 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_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 17108 bytes
SHA-256: 0146269a2e2f997acfcb9b37557000e83732ef9f24b7a1c8eaf9dd7ca3009661
font_01_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 10232 bytes
SHA-256: d9f3dcfe2ec66eea3dc74ecee718ef30d5e54e35b73161100333bcc8ecd8c7b0
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1