Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ac7096346a4971…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 21:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4fd460737543ec83124ec4d7879c7602 SHA-1: df260c3a643115859f6989b3ff3f156cd7515ff8 SHA-256: 29ac7096346a497150bfec88c8e13d4e33dec49f9d2aa96a8f16ad19a8774df4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cometsecurity.in/admin/userfiles/file/bijewuvugoriguwegud.pdf In PDF document text
    • http://garagehayashi.com/js/upload/files/duwadipoxidunamu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/45925475247.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073efc98f2c7---nerexogu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ed4b86716e4fc1b8b62ac0b75bdd781b/47739504626.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/pisemu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f512886f12---belurajudijugawetefu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1629834230360723278.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c15565de2ef9db0305df21ee1635375/xanekizunemafitojila.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/72815166607.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/lebuwuribanap.pdfIn PDF document text
    • https://parfumzone.ro/files/file/lesetisusozilosixilofi.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/10177391890.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/18r9ig63rdbj1l4tv49kd3ce84/bomitodosodokaga.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/82115266501.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jasidodasumajonoluda.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/velevadewinamuwegelixoto.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/gapavilepizesobasa.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/91927052074.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wubeneros.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e66db536666584bc677f8c0e71aff46/mabisusugojakevanuxarolof.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/76993472965.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a896c550ab2---73136615966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=statement+of+changes+in+equity+format+pdfPDF 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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 18604 bytes
SHA-256: d6ec4aa3b7713c94165db7907d25d877e13122bce382632aa0de7771a20616bc
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 11456 bytes
SHA-256: 8d15787f02a912325e943c75bd98dec45382e216fae27de38d89904d5b2dcaa2
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1