Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5d24a72ab59b39…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d296a5e02a8fe10a5c9bcd59dfa9523 SHA-1: f8b5a20a1bee5de1c8b34a41c6db1334acb29038 SHA-256: ce5d24a72ab59b39e59570df103da7e0c38f517578425520c8cf3a1cc2fcf171
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic where users are prompted to download an archive, likely password-protected, to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49249ceee---17895888050.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d04e16bdf6cfd21c646339abe7e5f1e6/19569855302.pdf
    • http://lycee-elm.org/userfiles/file/fuxuzivizesaturi.pdf
    • https://gizaviation.com/uploads/files/xakefu.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4eb66f29---46887863816.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/4661581688.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787832824e2---70328829801.pdf
    • http://travelport.pl/userfiles//file/volejisuxa.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ps3vpgjbhhamp6e1hug4vkn5k/53162814482.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/152jhh2mm8dtuo424hraogf3tg/dogevek.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/194b894b6286decc9af98e6c66e069f7/fegudewasadeteze.pdf
    • https://aartipalette.com/userfiles/file/wanexorokelosujusa.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a18d51056791a487574057d2e94a3891/bitutimulusemorixibonexaz.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160823f67d5e56---89306376181.pdf
    • https://clifestyle.net/uploades/userfiles/file/44755810611.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/finodasowukabes.pdf
    • http://bioident.pl/photos_fck/file/gogoketusaxutoreg.pdf
    • http://surtek.biz/image/files/20150115_090747.pdf
    • https://kovtec.pl/eurostyl/photos/file/jinivawuxemuzak.pdf
    • http://mdfgiare.com/upload/files/pegebetigugifo.pdf
    • https://hanahana.vn/media/ftp/file/69560331748.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4277a19b5---51828409401.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bae0f2f5e5f3df155a833a987549c7bd/70575374237.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=time+conquers+all
    • 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_off0000d4b5.bin
dcd72509f432e2502ac60faa3567f62f71b6cc67010582d124d8fe740f211c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16924 bytes
font_01_sfnt_off000100e8.bin
b8740642de3e43cbbf0c199cac5272267f53ba8d4ff115e9ffed12fb31010679
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 10500 bytes
font_02_sfnt_off000118c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes