Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9352a2d2d4e96…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 19:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a0f4e44be737619d14118478397b74d SHA-1: 5b9499b6d0dd2c0125e28d2a685c4c7deea1633b SHA-256: 8fd9352a2d2d4e96d333fcb8bcce86a5a33d58255b307e753b31f1b4931ade8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various URLs, including one hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sozopolihills.com/userfiles/file/sutasalux.pdf In PDF document text
    • http://elrey-uslugi.ru/media/file/redubezej.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161425c75472a6---27952499087.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8c8a9e36---47412162660.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109141618259550.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bonitofi.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/9003501489.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/72731672127.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/89064457204.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/33931304422.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dafumuvalovoxufet.pdfIn PDF document text
    • https://siroyensao.com/upload/files/foxepunofoxefavapogin.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/eee0fede2cbcf9428169dac3646a62cc/61206357513.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/88901905127.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/nemikufojifotapijilo.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/xamumuduloxerijivasug.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/33757937833.pdfIn PDF document text
    • http://hueide.com/upload/files/vefuba.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/79358912980.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/zoradulagisexufijizi.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/30835823813.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40923548868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=slow+down+video+androidPDF 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 10200 bytes
SHA-256: 88908a12f444d376734817cda2ef907140721b8d18790a145c763e86649beb80
font_01_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 14596 bytes
SHA-256: 4782b3e2e1c7c3afee242d60b1db98a44e7b3c3ff31d2ab6758eda6a677811b1

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