Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f89569728fb66c9…

MALICIOUS

PDF

76.7 KB Created: 2021-07-03 09:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c46a08532cbe490fcb952f5ace9dbc2 SHA-1: 2a949b3dd8369ec6289f6a3162ca8e12094af5ab SHA-256: 8f89569728fb66c9089d10fa1497f946e1ae679dfd1ff3f483328891d677ddc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for hosting malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608395ecbc15a---67449915982.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803f63c0afe---zukimakadin.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb9cb0996---80891180344.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/cd75070b4ef57021e4bfa00083f405fa/jubugoralatuvobubade.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607788f3d6bc6---51623380162.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed59b7d223---domelofuzepizexu.pdf
    • http://biotop-zamosc.pl/userfiles/file/kizefer.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/52fad90fbddbf96dae8f97af237eb7bc/68767468246.pdf
    • http://irths.com/upload_files/files/tamojijibadisanodegive.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38bbb2fdd---famasejinetodinu.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iajvk9p0trq8dmn1j0f549q8n/41186837605.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6f7022552047db85bfafdc8175fd3666/gudisedi.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a985c07249107cc3a12775e91e44dedc/navitisufoba.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/sakabitunuzax.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122bad417f---9547981012.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160db3149d5a61---warerufepuwusumafudo.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7e9491db64a68d59407e95d6deec42c8/fegunonirevedega.pdf
    • https://advantagelic.com/singhania/downloads/file/40685333255.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c690ccafa50---93819215881.pdf
    • http://gorisum.net/fckeditor/upload_file/file/81518581578.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/32559144391.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070e68a8ad5e---70161048604.pdf
    • http://ahxxzx.com/userfiles/202105/file/18721271479.pdf
    • http://akcjonariusz.com/UserFiles/file/97952746868.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=scanner+to+word+converter
    • 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_off0000cbad.bin
be07a29f4cb0035f5a18818c3afbeb43f102f7cd92b48c6557bbb8748934f2f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 16328 bytes
font_01_sfnt_off0000f632.bin
ea2da4a02a095293d301b38ddd09912a93feb8622b0e176e15ae0f85fa3b3421
pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10284 bytes
font_02_sfnt_off00010d91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes