Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989a1dd1c7e0555…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 04:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3034c69ea9f5278f712224782239e0e SHA-1: c7e073fe901c4b425a04a73c0cc288f988cb4c38 SHA-256: b989a1dd1c7e0555cbeb3e934d683b841a6d85c4e3dddb9a9df6909d229c1421
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/38b7cd7c2c365cf1e21476798cfa7cbd/sixexegavufox.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d0184835---20229906848.pdf
    • http://jyotiacademicpress.org/uploads/file/97684405308.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d0e48fc1a85c587fdcbf0fcfcaafa588/bujesisas.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7ff030d3bdd12107c552f88794f382c7/21756987459.pdf
    • http://apsons.eu/files/file/298702340.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969623b6949---84010091291.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/df4tnecrehjiijkruq4361abus/lotuzegovaw.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tgrhot8h5j5maacge7m621mjr0/69608428853.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4b2d8a87---rolebamawefabevus.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/44740817681.pdf
    • https://agrilaui.com/userfiles/file/levepegukiwo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p2b5gm024l3lejkp9oj8rvg47n/vekajolevodu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160796f4609100---xibunusezivi.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37ac3542d---biwos.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/od121fmleuj3758sc57urn073f/61348246868.pdf
    • https://www.profiemg.cz/upload/ck/files/35252814130.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eacc58bf1c---34682465024.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+compare+two+excel+sheets+using+vlookup+step+by+step
    • 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_off0000ec1e.bin
2a514545826dfb2e60caa7b75fb39c9b27e6cf31eced9d50a47a41cbafe702f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 18332 bytes
font_01_sfnt_off00011cfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 16792 bytes
font_02_sfnt_off00013511.bin
9167acb2f627f2d06851e499f2c2a090fb4e147bc13eb06191dec56bf14cfe5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 11512 bytes