Malicious PDF — malware analysis report

Static analysis result for SHA-256 796bd74a0c2affdc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 21:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c1027708890edda628a00f94b43de61 SHA-1: abccaa036731c56affa90f8fd71b9b24b50fae07 SHA-256: 796bd74a0c2affdc1f4ee8d41689125440702dd85b725f025dad56515bc50321
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS uploads, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/94932829420.pdf
    • http://myconnect-thailand.com/image/upload/File/98464754112.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133136c03c1f---14035797904.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7f0d6ebb---durivimuxabidizanon.pdf
    • http://timebymtm.com/upload/files/wetirajejal.pdf
    • http://universalestetic.com/userfiles/file/9253944479.pdf
    • http://goopenapp.com/uploads/files/fezulipimarapoxid.pdf
    • http://chixue.com/uploadfile/file/20210906134713.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db369cae4---20335721863.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/jakemaxopobefejupibajexu.pdf
    • http://glavis.biz/userfiles/file/nudazosafisosi.pdf
    • https://ccichn.vn/data/upload/file/burorivujopujolegotizu.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/96886854281.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/6957605722.pdf
    • http://ambvetfanini.eu/userfiles/files/28791824718.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/29094850935.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd6777127---pemexomekegipoxowepixa.pdf
    • https://lotteppta.net/beta/assets/file/81536514084.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab296ce9d---5713688862.pdf
    • http://kamnitikamini.si/upload/files/govorot.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/pifubukoxiz.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jawibabexidimimozez.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15dea9ae6---faritogofizobemavopu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+cleo+mods+android+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_off0000c8a2.bin
07260e43d0b23ae8a1454235f30ae2180099c916c5a5125db69573333b9793c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 10804 bytes
font_01_sfnt_off0000e185.bin
e315e5bac0d826e57273dfdf4a16aafa4d4410192fac55907bb970abe1cab19c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 20808 bytes
font_02_sfnt_off000117f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16792 bytes