Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db17763b05ba3e0…

MALICIOUS

PDF

83.6 KB Created: 2021-07-17 15:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 30597d2b49e265543e7ce085922fa776 SHA-1: 9be8b77949494d2038e9775879b16fba731ea2bc SHA-256: 7db17763b05ba3e0941b804289fa6f0c5d0153ea723c56aac8bb861d7950696f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9fc6aab5017240c4bd897c14f89a2d43/bunikokexujudagagu.pdf In PDF document text
    • https://carsen.sk/editor_uploads/system/files/26560374208.pdfIn PDF document text
    • https://latework.cz/soubory/62556683022.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/1860284864.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mejotiwali.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/jusenerokikemev.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/tuvipafagute.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5aea46f876d52f9c8493a952a948ab6d/kepupewubapub.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/17636120931.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/9729638616.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2953e45bee7e5db537fea2fe3063b498/xaxowudi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tqe0ko2k12m4hbsrtembrkvi8o/linifabejemojowutaluga.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68661486034.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/31aa2ldq0674646go15kha3mft/61199864530.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/xuwokozaserafora.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xufolajizafazubokupuvonu.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/paxanowujozuvipovakip.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429145834295619.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/jo6n35gqoftjmo2bctmnj47fpl/xovezeneropudamu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/42731005793.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8d46d8c1cc4d6b9457a12153aeff5537/28896062034.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bab08a05de5ca140e88facfea8d36684/21476442332.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zirulet.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095dccd3dab9---gewuporofidoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=swelling+at+big+toe+jointPDF link annotation
    • 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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10448 bytes
SHA-256: b0382afe0767e48cadf9fe73a988492d071a2525bb5959922e22785c6b568f6f
font_02_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 16668 bytes
SHA-256: 174e71904d2a3f7975437fa8a0bf12b97de8e0cc8c0317b90907ad69a5c02b6c

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