Malicious PDF — malware analysis report

Static analysis result for SHA-256 96727604c23611ae…

MALICIOUS

PDF

69.8 KB Created: 2021-05-13 11:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7992809aa1ee85bd55fba9fd7d6eba6b SHA-1: fdb68fbd4c0fa979b7056d0d64469ce02149915e SHA-256: 96727604c23611ae8901b299ee93455356df4c2200b8673e3c6bd328b34b9343
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that these links are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

Heuristics 4

  • 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
  • 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://allamericannursing.com/userfiles/file/79958343338.pdf
    • http://novussiteyonetimi.com/uploads/file/sovirigat.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3df178a434b088d52d5f93489b45dbc7/10360754657.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/64ea6024674627470c9e86964a70625c/33163861773.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b29c28f10b40c0c5399aaffc606bf4e2/norulatizisuluw.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/15c13397469492c91a7bacb1a4add536/kifelajegajedonasopagaki.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160967cfd16764---70402371591.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed6b6cf2a---95236506333.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d398c2ca82---14037977322.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7stctirhk4dedrk87lcvl3it29/7677060625.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p728kqo9gkq0umitk18q9kinei/gevidokugotejefu.pdf
    • http://afghansolar.com/userfiles/file/tivexozatiketafag.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/69e5e24af73d03a451334c065b00a7fe/46336183821.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3m1nv6tp0dl55obnobec53vvv2/55525101574.pdf
    • https://bisnismedsos.com/userfiles/file/27346918315.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/069dd00248d943d7f8b65a97db08b22c/89278750984.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/suvokome.pdf
    • http://notarbrazda.cz/userfiles/file/37186125076.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=knight+chronicle+kristian+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53e.bin
750fe24f927dc580ee811468a4f792174d343593b9a73edfd5a11ed352c51da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 5232 bytes
font_01_sfnt_off0000f700.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 1800 bytes

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