Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4736462763c1e3…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 19:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0cdb69a51cd006bb6e39ccff662a3f06 SHA-1: 25e7f3fb8424e398bea108c464bbc3e9ed6d8418 SHA-256: 5b4736462763c1e328ecff5eb7d2ef087c786c876d721b3910a4f9e59bdfcb75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a link farm used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=newton%27s+first+law+of+motion+easy+definition PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/21de9e8827d2abb3ee60a2869ea576b4/ripetibudow.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sugofusojonok.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/xugedejazaninegamisuvo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/22l54kr5jk5ojb25nakumn1iki/vokenewaburi.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/jexifipiwexijab.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xijijepipuvobiri.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b75f8ed45---83244567911.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4702602d0e---zunuduw.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bevomekozex.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/93865996453.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70619622025.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xajekoj.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/robabiniruk.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/pixizef.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/9757387607.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/nisuwebodexefivis.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/89782495565.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160961d699b426---kidenesufetivakatobizi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/timowukunofijudepax.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9c19fafc---dovifiwodiv.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/pupubotitujiwabipom.pdfIn PDF document text
    • http://temple.mo/userfiles/file/16175326087.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/pinax.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f3f33349---21938703455.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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10728 bytes
SHA-256: 3f03997597d93be0ebde41934da23301f5240dce91c361bca40a51441282f575
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16780 bytes
SHA-256: 38cb53d1d02cabe40565d18a990cbe0b086c7788997165f8bcd460530cfcd775