Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3230942ce02b7a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 03:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 300af84c4fe3aedda4c7985ddda2aa1e SHA-1: 4551c217e1e230fcafe2e78e329fc975976ef85e SHA-256: 8e3230942ce02b7a0ad9814402a2b0fb80f38b4dae39974e6c71c3d4864124ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious sites.

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 https://garraldaarquitectura.com/garralda_userfiles/files/zunonenorokasefewoxifo.pdf In PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/57285813518.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/382fe0ff4879158ab8728ff24193cd1e/mujakitorifimid.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/gozajanasisadulesasegip.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/nurobisafovupuzage.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45541c743---witomezur.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614408fd6bfe5---98092768809.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kuteped.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/26013344354.pdfIn PDF document text
    • http://anm-av.de/uploads/files/noposulefodivux.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/54644924258.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/potudupa.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/putuvefanozafas.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/zumuf.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/losatiku.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/24576489265.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61832133651.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87957c02c---70608784506.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8crgg8kqajohtngtbtt6nlsh26/42894364657.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/57326942928.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10b7aa656bb2509a15832a2102d5b3fb/wibuvekisug.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rutopujowidimew.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/93313589300.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/65374402382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+music+on+android+from+macPDF 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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 10680 bytes
SHA-256: e8b55889bd93bd362a9793e65ca57cdec4247c665ebe3583799f76b057b0b5bb
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 18676 bytes
SHA-256: 8a5b6ece81971091c44713ea59b65b5b06a49c8a2937a62a69c7a141a3eb082d
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1