Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d01c2b57388e41…

MALICIOUS

PDF

97.1 KB Created: 2021-09-01 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90d0d8855a8bd07e4306c05d04c70603 SHA-1: dc9b4568cb561afab2eee70b076ad93040fd1937 SHA-256: b0d01c2b57388e41a04352fb2fde270bc09cb3506ae5f20d8b3faa6a2dbbfb94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=ld+player+apk+for+android PDF link annotation
    • http://abcbyspu.com/ckfinder/images_store/files/13966570397.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/fobapepusuvilisarexe.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/juvukanodu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8217736e52---jirilusipipadavewowa.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/bisoboputen.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/65493181618.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/46089444619.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/tisodalibufusefu.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/93175289524.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/73473913479.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/puvukomamulef.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc5d9b4305---rofilewesizazulitobagiv.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210726_EFCB7676608F6A9F.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/7916073281.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/46424726622.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/43142658995.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3daf88f263---94954291553.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6576bce81---6486022467.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jpigtbm78qjtl0vp597ce9l569/kiwexujisadirudozasezek.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/kevaxir.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ba1c70c2---dewimasivimedubifeteguvil.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/84002039491.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/4503226643.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e639cc9ffa00463d5b259c8e4c01c053/54359865337.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/puzuzodemil.pdfIn PDF document text
    • 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_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 10388 bytes
SHA-256: f558f9f7ed892345aabc2692579525182436b0e3b042936f0bed3579e6bf6e75
font_02_sfnt_off000145b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B9 18496 bytes
SHA-256: bf1645b61508e9b4a49e14ded81ad27c9b878d239e55588deb91631977fab252