Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b554a7feef4ce3…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 07:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14a526752e90e322e4e5fdfb111ff0c2 SHA-1: 4bef97ab3763be27d754a7521adef37fe6683af1 SHA-256: 72b554a7feef4ce3c35e7224d13f49f435618352a8099e93831fdc99e2f1f285
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://metrosecuritynepal.com/assets/userfiles/files/vegogoxagakad.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/94668247263.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/pediburad.pdf
    • http://sowiik.pl/userfiles/file/molizobegukevisadubil.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/77644355187.pdf
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/51055133970.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b74ffd0008---poxenitudonederinisi.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/81558443c35b75976614570f6c751376/fuzovudogomadixajas.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/20402990223.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/60379986231.pdf
    • http://murzilka.biz/images/uploads/file/45874466838.pdf
    • https://iohrp.org/f_files/files/30843619918.pdf
    • https://pinyardim.com/calisma2/files/uploads/20374128667.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614af816016e0---94784682582.pdf
    • https://vannordenvastgoed.nl/userfiles/file/nirufaxenolijiwiv.pdf
    • http://riccaassociati.eu/userfiles/files/4629675453.pdf
    • http://panziofabian.hu/fck_kepek/39377426571.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/64638874738.pdf
    • http://cottoneauto.it/userfiles/files/buxalu.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f5d1dfd41---datalepisub.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155cb5e5b1dd---detalaranepudakemizuged.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d455183ff---kikasivuzos.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f060b53d---4994796852.pdf
    • http://sgo-bage.com/public/files/files/66590386955.pdf
    • http://popmetre.com/news/files/midozimulisepilalawu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=english+grammar+noun+notes+pdf
    • 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_off0000b603.bin
f2630dfe1fde652c7c90315c26bb3d4bca1be116323b9ce8811c5dc2aefc5fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 11028 bytes
font_01_sfnt_off0000cf36.bin
48e4958467f22bcb0c5f15469665c2cda244f04866592ad6bfdaf2769f795341
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 17176 bytes
font_02_sfnt_off0000fae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes