Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41a1804c969b707…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 10:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b11fed130c182c29d23a6221d9264080 SHA-1: 98c4dd335839aae812d642a7d1ea9e5d1772868f SHA-256: d41a1804c969b707357d72235f66b29ff996736eb175bd412768ca50b9827aef
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6473

Heuristics 5

  • 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
  • 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://suacuacuonthanhhoa.com/upload/files/famaferu.pdf In PDF document text
    • http://fzcce.com/aimgs/uload/files/86799639284.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/nejelexunejikepunigu.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ki1h7rdqc68shnlo2n1t7j1vje/wofazovitisigub.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210810071143.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/25452521922.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tukog.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/balaju.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6ba48242---suwikeviwux.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/rupalotorulafi.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/fawozumevu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fde43550db465fd45dfbf24228a81b5c/83907240726.pdfIn PDF document text
    • http://vce34.ru/attachments/file/migowekomofunideval.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b0637164dec9b02fa0d0d0aafefdeed3/wevafazitesofirulof.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/97be44f669f9ab48034e585e085aa97f/giwibetidanil.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23894bc1c---36212620088.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/vufomasofebodajibewidenol.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0877434c---xemejo.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/tipuzose.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/wuxitavosu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ff970e6a---fenorelonodifivamozava.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/bixilu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/99658623824.pdfIn PDF document text
    • https://tonitomov.com/picture/file/36009875888.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/mezarabebuzisiberoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=retropharyngeal+course+of+the+right+internal+carotid+arteryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 17288 bytes
SHA-256: fece4a994fd479ad647dc104e604c31f82e5de43945eb8cec7d6b2de4c7cbb63