Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c38857eb60bfd77…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 23:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8056e22638fc925c900776ac1261ffd SHA-1: 89f0faa8cb435e89de028ee20c445737d0eda436 SHA-256: 5c38857eb60bfd77389427793c6e28af8062c4409aeaf53786f2ae61bc8f7c6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised websites, directing users to download files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous unknown reputation URLs, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://beergolfers.com./blog/images/file/lexofibaruguremi.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5c9c114b069a5c5f39ad5653570a45c6/samoke.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12b2cc607---62460502499.pdf
    • http://www.kickcommerce.com/userfiles/file/fufotasokidugikeg.pdf
    • http://ahcxdq.com/uploads/file/021123352928.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c506bd1c5c8546f8e63179339df67433/25280047851.pdf
    • http://qca.ch/userfiles/file/nawenoperagajoguwelopu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709cfc8b85a---13259526698.pdf
    • https://kartplast.com/resimler/files/joteviboriz.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/do4hl1bt72jerqalupaj7vdakl/98198100498.pdf
    • http://sam-global.ch/files/file/14537996565.pdf
    • https://agrilaui.com/userfiles/file/mezag.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/716c519404bf0109c16b22963cf55b70/98410566476.pdf
    • http://vencedor.coop/images/admin/file/22829271797.pdf
    • http://lucann.com/Upload/file/dipena.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69e91310e---jufodevebedigajivogav.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608da765ee6c6---kojamevol.pdf
    • http://yuhenganquan.com/userfiles/file/20210618041518_106426912.pdf
    • http://k1a.ru/images/files/file/nemojexivujadi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090660c48e16---72107037786.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/66f6cd9c736b6b8709269f59fc572870/matigexumisibunuxumuj.pdf
    • http://cokhihoaiduc.com/uploads/files/92038195947.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+need+for+speed+most+wanted+for+pc+windows+10+full+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
font_01_sfnt_off00010e21.bin
567f803b229a5944e3515b761f3e08580313030396899a9c754c7db71c941de3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 17056 bytes
font_02_sfnt_off00013aac.bin
bcb10f79ab05ae56ed5f65ca46938eabea3cb4683ea3dc6b3cb3956ceb8d917a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 11208 bytes