Malicious PDF — malware analysis report

Static analysis result for SHA-256 170e0a9512d963d6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 18:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ef4ccd49a1e4dd3b250bde801f096bb SHA-1: 56e17411c73054fdba23026c9b4ad553542bc50c SHA-256: 170e0a9512d963d645873561568430c6a762686f3fbb999a12c85f4c2ecd8d97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to phish or distribute further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://metrominicabs.com/survey/userfiles/files/mubafawukemexako.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/52995399571.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/labefa.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zikofeneloxu.pdfIn PDF document text
    • http://webbuilders.com/files/file/zinilusipuxekerotazuk.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/49847262332.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/56862747812.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tosizitubomema.pdfIn PDF document text
    • https://laser123.com/geektic/files/58090704607.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/wixalalupufadazadelaz.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9dd5f0164ccc06b65fb4615299258c45/54667158567.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c9fb5b---22443488225.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/joduvekisivajoven.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/nifewijoligekidudifov.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/35721129636.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/78843614292.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eosc78m84339u3m93onou2lp77/24110925288.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bemexidosifig.pdfIn PDF document text
    • https://digireg.ch/upload/56089464443.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///83066470577.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595c8c2b50---48272107528.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/64628184036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=justice+league+snyder+cut+full+movie+freePDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/3080655192.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_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 11092 bytes
SHA-256: 387f06056bdf739641502f5c559a8e40c6b8cc5c34125c25b380572864d46c74
font_01_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 17292 bytes
SHA-256: 048b96dec3016e533105e8ed4c554e81f4c0d5f35b28d70977da2b0d5fff535e
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1