Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b1e33de3eda007…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 02:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37f13ab0999d2864989ca6b3462703a0 SHA-1: f168cd3e94b9ceafaa9acdb9d02c4419a88a935e SHA-256: c6b1e33de3eda007d1bb6853f0a093037369359de5ee8194c096b795fdb8fffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to external resources, including compromised CMS uploads and disposable hosting, suggests it is designed to redirect users to malicious sites or download further payloads. The document body was unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b395547217---66875640747.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2c9e4d475bf46a2a48bf01b6dbe5179/lexad.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/kukiwupo.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/teraresaxowegarufiw.pdfIn PDF document text
    • http://hmed.vn/upload/files/gotasakofiwasus.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/48012107861.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908082529.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/dunoku.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/73857398471.pdfIn PDF document text
    • http://vejwun.cz/images/58212858559.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/toperupu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/12744565776.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405ea5abe7---nogojamajagovifunuk.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/21225605411.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.pdfIn PDF document text
    • http://forti.in/userfiles/file/zegogavevarukorivawu.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/sexazotivufuvunun.pdfIn PDF document text
    • https://best-label.com/upload/files/69081831258.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/81104702098.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/tasegekipikexukowibebolew.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3cb754cdadc44973ddc79317db49c576/jakutirabafudevoku.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/bofulapasisirilozina.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/libogelagafa.pdfIn PDF document text
    • https://coil.hk/upload/files/gozulusokawazunixerizowut.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/18265213872.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/merikowifolifegojupupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chicken+invaders+4+mod+apkPDF 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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 14972 bytes
SHA-256: f987d0e22d87324c259f25ebf27f6e334c7b59cf3179df3766f26050391b61d5
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10904 bytes
SHA-256: 3d1d591affe24f56908b9d35ed3accf1faabd977c7145e9bbfe4ae4b0bc3531c

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