Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d9527349031633…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b14bda98b194a806775d313e6390ae75 SHA-1: a3845d1dfb5dff9fe19e84c394568fd5fda4ec93 SHA-256: 47d95273490316332ece71ee6a15484e5c8da614b1d9eba692c4f0cc02765242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://irlanc.ru/uplcv?utm_term=three+protective+layers+of+the+brain PDF link annotation
    • https://beltamas.by/content/Files/47649578863.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dgif1jmkkge848esr5tm845hl6/96113803985.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061720533273499.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/do5uaigdsmj432kaaqj11nj519/87234288405.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210626_0D7FF9D04DBE348D.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/xasapabadabozajarudexebi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00931393b4---42294870031.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/49578033209.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/98019178484.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gvek2k7c661gami61vnnib0ddp/poson.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/3223189132.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/xesevos.pdfIn PDF document text
    • http://pvvc.cz/files/repilamorobuzolilufopuve.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/binevugulifekab.pdfIn PDF document text
    • http://kasargod.net/uploads/file/17572266738.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26279445957.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/midurire.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b9d68f84d51ce407b50c372dc532b699/69673262511.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sb36miosfrva0rd3k1700q0oa/81425042719.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/lelilimobasojojipofubaba.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3d8704b4---27321905490.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/37233107323.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/momanaxabagaxaluwufovenu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g2qk405i1knbctc8icr2evst8n/14921796357.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/xutonenafivafabimevoga.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5lqqghf2tpq98mpqfqii2rq0e8/ladabox.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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10860 bytes
SHA-256: 1344068a590f758063a83362df7a56af36b9b23b4936f8b1227ae6caaba281a7
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 18124 bytes
SHA-256: 40340db059fbca18a352f5e42e9d45fd5d0739f1cad3ef7247e733a30f39d271
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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