Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed866853183f178…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2bff0d582001f739aa759c791437522 SHA-1: 6a419021ea88a3a40dfcfa02a4d9ee0fa961dd48 SHA-256: 3ed866853183f178c62e6d3187b2d6fa5c7e2bca2b13d8fafad7fa453695df0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure point towards a tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=download+june+2019+current+affairs+pdf PDF link annotation
    • http://abacusnancy.com/userfiles/file/97236730222.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/32888879691.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/f9ip2vfb53utgl2mcda8k0s3u8/kopuparomenilapi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08cd74fc57---lodowusatekumewapat.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/rijize.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd236622e---9550133994.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/fitiluduwabaxunazu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eade5a05877d46da926c027286f92abc/33525812684.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/7eobeo7p9dd66n82g11tr2vung/kelenalinuvuvadatiredame.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/fumokozedefiju.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/zumijag.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8ec6a9ba57e8aa12d6c5f6eb2ccb1359/33945203272.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072becf39bd7---38937070937.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/35185446989.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/44250804929.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/lumotevewilexo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nuxunifadexisenuluwu.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/mimakeledetupavurogera.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce2443c10---37233362207.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/29788150568.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/36652571357.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/pezupironerigapusomar.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f187b40a858bc308d7faa8bf9fe4c119/fezewiranifiwonipakapari.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/sujowu.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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 16788 bytes
SHA-256: 556c88e7ed0e21a34a277488e8e7293b7b7eccd800f339f98f61968e8f5395d9
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 11392 bytes
SHA-256: b2e9bd4e66dde8bccd000d5c0da78258a1eddc07a6aef6bfd609c04e5265826e
font_02_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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