Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a53560f6b2a934…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 11:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd6e5d34ce200b1a92f25776fe96cefa SHA-1: e63d6cd48502eb9e7873de1d1f1d5adf2a1c6284 SHA-256: a3a53560f6b2a934f41ee5ce897a9ee487436424ee60ccc4df870913cbcf7663
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to host or redirect to malicious content. The presence of JavaScript indicates an intent to execute malicious code, likely for downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://fenicia.uy/fenicia.com.uy/uploads/files/kaxezarafexanerer.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/94540908640.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/pedikawojamuvadigelojixad.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/bewipe.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/96956143290.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/kogupofeb.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/liwapovidijinexi.pdfIn PDF document text
    • http://maxbrio.kr/files/files/43855924500.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/6538159493.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tixuzesubiruxamunogawana.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/2767150362.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jasatok.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090910260033.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/dilusekiratu.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/86769304778.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/dorovokovexe.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d7361859---45891904504.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zojapobefikaviva.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/16213489654.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbe619a04---dinumozewezazubitenufavi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fff34eab---lowigisanuvokif.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81c46e48---57115277496.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/lusatuzoxogajobizolid.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/57982403555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=0gomovies+malayalam+movies+2021PDF 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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10524 bytes
SHA-256: 805032481d8cd5565ace577c220fbe14bcfc1c39dcb36585767844be8b2d0f0c
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 17976 bytes
SHA-256: e3dec0cebd1df89c9424c2614cccb207c47ff9a977643c11b0a43cc5d5291ef4
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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