Malicious PDF — malware analysis report

Static analysis result for SHA-256 20936cd188668503…

MALICIOUS

PDF

79.0 KB Created: 2021-11-02 06:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35b5bceb7d09b39c8627ad2d0f0cba53 SHA-1: cb01e018c0b3649a30580563f85dc2d48a375f47 SHA-256: 20936cd188668503ede2d575a785e2e86cfca2484b6eba59cbb59e4a1eb27b28
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and link farm indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6406

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://ceylanotel.com/firma/files/sukiwuvilox.pdf In PDF document text
    • https://dienmayngalinh.com/img/files/76219419078.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/begifojajixipifavofizurup.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6386b490f1048807708a09482a64f97d/78822918568.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4be78e82bae3282cc060648cc27de5c6/94734134996.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/dubadorubedevurak.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/pegofejawewotovuwal.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/dusuruv.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/62863891339.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/70514959913.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/dexabowiwuzunijimu.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/92506504536.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/sopigibojerunilapogal.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdehmq3itr61lt5m1quel7vvp6/83390071308.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/felogubod.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/17561769441.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/kimekusoxugegetegipepamit.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/77797611546.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/zesolofadelurepipel.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020804583485.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/43314701377.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/zavabobogujanosug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=the+saturated+self+gergen+pdfPDF link annotation
    • 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 18064 bytes
SHA-256: ecf4febb7b8d752edf220a021205ede4ae5f181a0505a24d76860eacbe764664
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 10628 bytes
SHA-256: 6eb9b46710d29184e14f37edb16803513c5b8fc16e71d8f7b67ffbaafadef0d7