Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf96d46eadb8c21b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 11:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2286a5f4f581980d07c1e8b6e19ae70 SHA-1: dc1ac91d2b9b98bb3cded1146445273188b2748d SHA-256: bf96d46eadb8c21b68db1b0b869baf82ee9431c670d589085324fe516743b9ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://foxgraphics.paulsfashion.in/files/poretineketewigeb.pdf
    • http://kalmi.ru/upfiles/files/26955444825.pdf
    • http://bjsddesign.com/filespath/files/20210908235759.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/4192042466.pdf
    • http://avon-bratislava.com/files/files/81709917858.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/midofefixam.pdf
    • https://equator-maritime.com/userfiles/file/rulor.pdf
    • http://mazdooradda.com/userfiles/file/44660397373.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/goduwitive.pdf
    • https://cuatudongnhatrang.com/uploads/files/65795653001.pdf
    • http://zoekidsworld.com/userfiles/file/53970502704.pdf
    • https://scmsgroup.org/ckfinder/userfiles/files/48094086199.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdf
    • http://fasson.vip/images/editor/files/zebusole.pdf
    • http://tridiart.cl/ckfinder/userfiles/files/37811968479.pdf
    • http://happyorderfood.com/uploads/files/wikomebipubajejupekujoja.pdf
    • https://curtain.jinware.com/upload/files/nazaxulodudozimiligudepad.pdf
    • http://misterholidaysanprisco.it/userfiles/files/16823106997.pdf
    • https://faktxeber.com/resimler/files/22520983361.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/95519510732.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/roluzitusavakexatodar.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bf1ad64b---sazekawolodofezabuno.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/tejaxomoxotafowekamasebe.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rc7a0788bbdabsbb8h6f6isk9q/49109536160.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148dabd99527---74556117204.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=n+track+pro+apk+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_off0000c04c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC04C 16792 bytes
font_01_sfnt_off0000d863.bin
c78d56309eacc4f2d52be05d2494ff51c9f9a60f5e8476e05905e55a96c601b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 10508 bytes
font_02_sfnt_off0000f084.bin
36af14e0a42a6bd1f15b32dee1de471649ff6549c9434730134251a72a3625dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16064 bytes