Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee7f5ed4eecf0bb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 11:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b3e82e76e5813299a62e90a99007561 SHA-1: 0827e041ace36a19524ec552e54985452e2a51b6 SHA-256: 8ee7f5ed4eecf0bbbd2e30ad5d94a249181fc03b6a8657dac22eb9ddb204a87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, such as http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161451c20921cb---31086482060.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uptownchantilly.com/uploads/files/51536955431.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c698c0ed2a32e13ab3bdcb230fadaa7/sisugupanogusixatik.pdf
    • https://kamwalibais.com/userfiles/file/36225978959.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097a18b929---12071351159.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161451c20921cb---31086482060.pdf
    • https://jck.ro/userfiles/file/58313588705.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/47820921743.pdf
    • https://officialbacknumber.com/editor_up/libevusegewiminivezaxawi.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc5040650---17940982279.pdf
    • http://beiwendq.com/userfiles/file/45150751337.pdf
    • http://radio6deenero.com/uploaded/files/44585119818.pdf
    • https://ferado.vn/userfiles/file/junuguda.pdf
    • http://c2r-auto.com/uploadfiles/file/2021091702435173499.pdf
    • http://uptownchantilly.com/uploads/files/menefidekibizinaronimogi.pdf
    • https://weldingportal.it/userfiles/file/ludesizogemeg.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614862f33a74b---73419383023.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631753979.pdf
    • http://arcos-eff.it/userfiles/files/98364372896.pdf
    • https://osiindia.org/ckfinder/userfiles/files/disaxobexojej.pdf
    • http://kant21.com/userData/board/file/33482916225.pdf
    • https://promoform.coreform.it/uploads/file/bimuxefijoxusafesa.pdf
    • https://artasedanasingaraja.com/uploadfck/file/simojeboketenolirefefop.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac231d5e5---remosazavajane.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+ultimate+apk
    • 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_off0000b5e8.bin
3a7f92384bc8c7c39ba15febced6dbbce40553f9bafa3301aee04004fde79eee
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 10312 bytes
font_01_sfnt_off0000cd23.bin
f8d87fe3fc9eb18da141927515fd96569ed53ae6c150a408470656034e26e93d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16160 bytes
font_02_sfnt_off0000f689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes