Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c37ec14f94eca…

MALICIOUS

PDF

82.0 KB Created: 2021-06-29 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c437817851c93e51483201b6b7acd882 SHA-1: 375c451089c61378d41ba8ab433d38f8b2d8548b SHA-256: f25c37ec14f94eca37222d439112f52b466602b460c15078f447061cbbf7cc12
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute or redirect to malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://northcoteplaza.com/userfiles/file/70791345840.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m0huo8mku1a7mhc13chmdsq8e4/vivuwokitodabasevifotidos.pdf
    • https://rpdev.org/ckfinder/userfiles/files/kifutufu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e34b0b17---putamegivanasesowagara.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210605_2911D67DB717ACBE.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700a940191---lifefumatuwoto.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce5ba7ad3---tirobepovonogi.pdf
    • http://akinmedikal.com/uploads/file/mumurizan.pdf
    • http://beastyenergy.com/userfiles/file/56294888692.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/vogenodujodidud.pdf
    • http://copy2d.com/ftp/image/file/28410838967.pdf
    • https://arerp.kr/data/file///rovugilafexodomolar.pdf
    • http://actlogistic.vn/upload/editor/files/43824898771.pdf
    • http://www.emailposte.com/pictures/bezujemobovibulad.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9be086e968df87f86336518ec89d77f3/2998272962.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mo6gg5msr4gr683jvgmuj34eke/33811388530.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb4b5e502---teziwojizezuluse.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0oc0rifbo6qladvm4i72pigh66/43335905957.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4622811d3f---mixubaxowo.pdf
    • https://balajitutorial.com/admin/userfiles/file/xinepozatupefevafumed.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a67f55b7bab1f87886bf4821a5344eba/71608968468.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jm0q535dqg9doc463256h4ope2/lonefawedaj.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f94c03194---xuxobob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unity+game+projects+free+download
    • 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_off0000d9cc.bin
ac80d9f6dec144828b75a173f41b3ec8c737ae6d34161aead005bde753a565da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 11300 bytes
font_01_sfnt_off0000f429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
font_02_sfnt_off00010c3b.bin
947eed65e77d6131e29341a5d3bbcfb228f5bdcc2a3ff9b6ab7b05f8ebafab20
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 17364 bytes