Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4ee7904e7970cf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 01:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a317978eee1ccfe5deb77bebaf9e135 SHA-1: 8aa192b4c9707035e9c7de7e9db0a9443049ff44 SHA-256: 4e4ee7904e7970cf8aaadebd37f6cfec7a56693c0e8dbe95e1be5b1b4b944a5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to external sites via embedded links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bf9e0ad2---pojidunuvov.pdf In PDF document text
    • https://eletmodguru.hu/files/files/vigodojak.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/nepowalepupivagoliles.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/85069460286.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xazelekuzexaxekovejix.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/gegexutokozujuruzemo.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210906211258.pdfIn PDF document text
    • https://2acontractor.it/images/file/lidapiwi.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/finegedowadududes.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109090638045752.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/14753400025.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/37586487714.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/41212284243.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dde54f385---mufub.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/sufaxowenapa.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/gotuzelogapagozowatawigod.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/27554855727.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/guzixezikog.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/1274201770.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/26992429612.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346d08f09---90058245893.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31143342429.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/miloxumalimo.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xedegiborixewizewesij.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/42055621265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unity+android+controlsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 17604 bytes
SHA-256: 8db04f36ad6e6a51b788326e34ea52aba894c285327173ecc4d6f6fb32e301bc
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10352 bytes
SHA-256: f6f248fd3644e2c69908ffeb08f33603a3e9695b181df87879b71d8a6c1d0dc4
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1