Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0df3b9b68857a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 05:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21e661c91bf8dbc0e50be3630092af8e SHA-1: 4c96662564f4ac4319d074f98ed07504266e34ae SHA-256: 3bf0df3b9b68857ae2a64dba8e981d12e13d3cd20bb99a719508949af7024ca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=the+tribez+build+a+village+mod PDF link annotation
    • https://fainitelecommunication.com/public/editorfiles/file/80436062170.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/96617629032.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50704844017.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/zemafixufagatasusubida.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/zupusiligureromajega.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/34465480956.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/xarufazazuwilat.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210917_9EA0EB49BB5C7039.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/sesitalite.pdfIn PDF document text
    • http://rurisnet.org/images/file/zefuwadalawugomukulo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/98771408485.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcgf8vt5ivj6q5elhn2k6902r3/53492214400.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/31871113878.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613303bdbc89d---zewoxevuseda.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/53953443503.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/90047749495.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/muxenezojanutadekogajog.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/rutarix.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/xobukapojivutisuti.pdfIn PDF document text
    • https://12shio4.com/contents/files/20071670915.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413a378ead5---zigovefovefowabowa.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75443232226.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kejuwekixogotepamiluboxep.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_off0000c0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 10752 bytes
SHA-256: a16ac6ebddee54042d15741f6413c3feaa9a35ac7c6f3a0e45e994d831e5a18f
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 15864 bytes
SHA-256: 1f0de5eca3e6f320cc8dd83b8550ce9c291b93c4226b12979e4ee55c4fa89314
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1