Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65ad00437c2a51c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 06:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ae0e672a46e994394318404f5cfd782 SHA-1: dad5226a8f1db6d640be558a02f15fd9d7ca5279 SHA-256: d65ad00437c2a51cb89204c208a96c56519bf92f1deab6c5a674053520a116d0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised or disposable hosting, a common tactic for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nfrostov.ru/upload/files/gifabebakuworot.pdf In PDF document text
    • http://xn--b1afbmo0alc.xn--p1ai/ckfinder/userfiles/files/pugazevepuwunimifozeseti.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e0412f32e8d06153e014a68502428117/biviwom.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/18782811916.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/fovapoxasejudojosumawozi.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/89963297396.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/65143296174.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/94586921115.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/gibesenag.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499525d1474---paxawu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/vewupikege.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/karevike.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/vikilaperosokuxizinikuxa.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vajetumezojelarurekiwofen.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140828bcbf5e---roluzulimeveduro.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/43094182370.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/rikanuloxotunupavow.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2fca91a46---911730078.pdfIn PDF document text
    • http://www.moyekolodin.com/files/javebesovuxe.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/19107408277.pdfIn PDF document text
    • http://parateam.cz/file/todososupizotumi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/52021815762.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xatuvinis.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fudanajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=play+minecraft+bedwars+online+freePDF 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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 16076 bytes
SHA-256: 2c976e0a2f7a094f6a0b70e1ada33ba76817f49e26773a85151a0ba585a6eb75
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10976 bytes
SHA-256: 1026893cb4bf412ce88208fb23e32b7f8b4611c1804878680b490c866408d4c8
font_02_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1