Malicious PDF — malware analysis report

Static analysis result for SHA-256 a748b76ab0fff1fb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 01:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0491eb096aac1ce2f55d8886a760629c SHA-1: c949c3a5e4df7e5a26ed04fff4c1974181fe67dc SHA-256: a748b76ab0fff1fb8394524c69e50a55d39f889f7592ccb1a1b1b6ee182c7531
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asiadomainstore.com/userfiles/file/pediwudiwafowopu.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/9746119730.pdf
    • http://moscowballet.ru/userfiles/file/64934074549.pdf
    • https://gestionarival.com/userfiles/file/92753236120.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/51190053736.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/gujimojopepepuzag.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a98138381---30265439921.pdf
    • https://ibshospitals.com/userfiles/file/giweguvupavipevuf.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/19436481887.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1b393e8b084d8032a4a9a178b331a7f/55664410706.pdf
    • http://trunglam.vn/uploads/userfiles/file/gobilurovodixunopivolaji.pdf
    • http://csc0451.com/userfiles/file/20210920052841_0xr5vj.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407234c82de---98714125220.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/62413670.pdf
    • https://www.campacinter.com/image/upload/File/89214452071.pdf
    • https://smilaxlabs.com/userfiles/files/15948376009.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/jesosebim.pdf
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdf
    • http://savvyais.com/userfiles/file/27383461960.pdf
    • https://hoavily.com/uploads/files/28622454354.pdf
    • https://fnb-concepts.com/images/uploads/files/89414393946.pdf
    • http://tbm-mova.by/images_from_html_editor/file/zopelazulasasofumer.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/jipozoxoberipulupebawin.pdf
    • https://planet-pvc.com/upload/files/torow.pdf
    • http://rasmesafar.net/basefile/basefiles/89309555923.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vlc+apk+android+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_off0000e0d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
font_01_sfnt_off0000f8ea.bin
2b2ca648223ce285db6b7c3482fcd90509a19a216730785bd85e61fed86d9cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 19392 bytes
font_02_sfnt_off00012a55.bin
24725f257fb09b780c3f74fd2357aa7006cf3490774059d139b98a93c049bb4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 10256 bytes