Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8c7da533b27c08…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 22:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4e305191fd363dd0878b29f25cf5744 SHA-1: 32fdbcb550fbb28f3f3eb1542b8a9e8166c295b1 SHA-256: bd8c7da533b27c0820d647185dbe18d3b26d30648c8eae0b3770015c12a69c9d
156 Risk Score

Malware Insights

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

The PDF contains a link farm structure, with numerous links pointing to disposable hosting and compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm pattern suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bdsps.org/slbdavbatala/userfiles/file/vuduxopiwevixafu.pdf In PDF document text
    • http://share-world.tw/userfiles/file/66990091335.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/75019558753.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75052b28d---23398755700.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/fexegejemoxeze.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/37122737118.pdfIn PDF document text
    • https://clubon.top/uploads/files/nogusobil.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/widexiniwizise.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/davomewe.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/32610110970.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/79137279408.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/15828837547.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/vofazowameneba.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/11554436592.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/dokinitavalodazuvo.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/71176289104.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/11006872190.pdfIn PDF document text
    • http://willbramephotography.com/lakopu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/rokotiboro.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/nepixugemaxo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3dff95a276cea3eb7740aed6739b8619/natapewezovoranegisanil.pdfIn PDF document text
    • http://rld-carbon.com/file/zobujal.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/56846176140.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51b7900e7---86852641430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=instagram+reels+update+downloadPDF 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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10780 bytes
SHA-256: a28dbac8161876c05931144f0e6abd366faa944bc5b13dc881f2987f3b459ab6
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 17844 bytes
SHA-256: 3e776085506e6c93fc04e6b4db8e723a267511c20a37f5a7175a7993d139c23c