Malicious PDF — malware analysis report

Static analysis result for SHA-256 934c6150ab0a1926…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 20:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8ebf6e73b9d5d73c44001ba1bdc67e1 SHA-1: f22ee81c0833d6a1f2f16d55725d6caef62bc2e6 SHA-256: 934c6150ab0a192682f8d7999dabbdd41b405f1a289c18e37ad8b6223e9c5016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious or phishing sites. Several URLs point to compromised WordPress upload directories, indicating a tactic to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=icloud+activation+lock+screen PDF link annotation
    • http://files.ibiza-ferien.de/file/15909356319.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/josiwakixevi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b0a2acc595b3e3df7ed5ef33d31bf758/51316565151.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/kibibekosali.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/29620685387.pdfIn PDF document text
    • https://yasacompany.com/upload/files/pitudutexomumiwedojotirib.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/29733404421.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/82850105294.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wudujepajagusuton.pdfIn PDF document text
    • http://surestegc.org/documentos/file/47497196602.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/81179745065.pdfIn PDF document text
    • http://ty-int.com/files/files/lebififuwup.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/liradoxavagufusato.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jowutofulipuxivejerutota.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/dexevirifa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zemumowuginesorerut.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tapuzodurof.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908075747172197.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/27093631872.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/ripifodulufilufoline.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614198a70f550---89295884241.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/jotox.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10572 bytes
SHA-256: 4069421a1d5911e72c93e634869ee3ed4a5ef395c23f3e00af1bf720ed5e5031
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 18572 bytes
SHA-256: 41246df47aab9546b514f1ba1e5a83ce0c084088bc55df3187ddcbf303469ade