Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dc115285e40769…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 19:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67db72fa04c52f1753a5f0a4b1c720ea SHA-1: 9a5974f538335735c96d7273b694b58c1039f752 SHA-256: e3dc115285e40769ea46d5ce3b4f0c7560caad3060c651094c6850d1f404eff1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://getrade.net/uploadfiles/file/12712369248.pdf
    • https://ntc-container.com/upload/files/4639631180.pdf
    • https://i-try.tw/upfile/files/2021/09/08/97252363249.pdf
    • http://asr-net.ru/uploads/files/zagidolumovadefenuwuw.pdf
    • http://baloneacessorios.com/_upload/file///24167614560.pdf
    • http://nuuts.mn/uploads/assets/3338306773.pdf
    • http://wsp.pl/userfiles/file/jetugo.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/43394948914.pdf
    • http://air-ned.com/uploads/files/22381698876.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1i3ae94210ajsvahgk1sri7jk0/41707567473.pdf
    • http://coinproject.com/userfiles/image/file/tirogegaxefexiritibumi.pdf
    • http://luluscafeonline.com/uploads/files/43171117813.pdf
    • https://ww150007.linebot.net/upfile/files/20210908052422.pdf
    • https://songhong-thudo.com/img/files/12632624123.pdf
    • https://funke.be/data/file/wuzum.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/kagagomagofuv.pdf
    • https://thehouseproduction.net/file/weloj.pdf
    • http://conelser.hu/fck_uploads/file/39686438141.pdf
    • https://indirimlipin.com/calisma2/files/uploads/watojomazagidomosu.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/xujoxetusitewiwivuzaxipu.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3213aec31---58215008160.pdf
    • http://tw-echen.com/uploads/files/202109120549173088.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/bad768263452b8e10721585414913808/komogizun.pdf
    • http://php-lounge.de/userfiles/file/52246043797.pdf
    • http://namlinhchisapa.com/userfiles/image/file/gebesudekufabuzegejeve.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=football+tv+android+app
    • 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_off0000e1b3.bin
cfd3160648af4634a6fe0f1fbe36b6c31859f2d1132f23c0599801516c8d8581
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 17844 bytes
font_01_sfnt_off00010f6b.bin
ee48fccf3edc53b01f14a1216df5689fbb60c110a4feb7b7aca601ebbda176e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 10268 bytes
font_02_sfnt_off0001265b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 16792 bytes