Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ce9ddde39fc0dc…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e359e8b15dbeec249e1a3a9a7de3b3ca SHA-1: 7fb46d9557f8077266a9f20cbf14091b602f2065 SHA-256: 36ce9ddde39fc0dc8b5a4715fd4c5d46adaca3f090a0eb131bc0543c83f37b40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=ak+47+mod+menu+avakin+life PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5bbf9b13049cd6961f78cdec88845f24/43520083847.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/43762016157.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/48832324837.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/58496954825.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109140410405228.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jafeboju.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/zuwige.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/melorewuzedulalefawilezo.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/46324601872.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210916200615_mt1rxz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613383a631e54.pdfIn PDF document text
    • http://cbstav.cz/file/xiwirotekazixetusawitazo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/98607684862.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1g06b5kfqq8qr9qi54d04ld1d5/75390719234.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/zifegasusaturel.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xikajefusidagawiguwir.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cc86cafd---24760488706.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/vasusitikifowunip.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473de6f485---95649072648.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/78804540508.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe66589c1---laledipobejixuvujev.pdfIn PDF document text
    • http://csp.hu/editor_up/tewururikalexexobunenijof.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/madab.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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 17480 bytes
SHA-256: 9c176fae35fa9e0fe4bfedae350e53eb224293e6d27c3b3163966f808feb23da
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10516 bytes
SHA-256: 9becfdfa80ab3883e6fbec7b5e6cd490fa2effc1b6c88e0b6f5f7267c0b9ca28

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