Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cace53941ff484…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 20:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d58f3a2d585efc2d9c8a1543bab549b SHA-1: ac34dd0007a8913de46bf2b837a0ee956ffc829b SHA-256: a4cace53941ff4845b23be501f033b2ec0b23f6935e7f23aedf7411a7bf6e153
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+mod+apk+instant+action PDF link annotation
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kuwevu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/6055481459.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/48787463037.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fuxudejorikubinizorazak.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/40842815755.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/87045455839.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099b680927---gekuwariwuzexig.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16315078349164.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/21728736961.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090803095073499.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/44420932872.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/87632227558.pdfIn PDF document text
    • http://faradbox.pl/files/file/vuvagatoxiwokazamomo.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_035955.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161412b89c3bd5---zasimepupuza.pdfIn PDF document text
    • https://olterus.net/contents/files/3703109456.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6549e3cbf---5901001180.pdfIn PDF document text
    • https://rajaunited.com/contents/files/zabedixunipopatefadisi.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/giwiso.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/tigamusowono.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/fanonigikafo.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/68926127591.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/kijena.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_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 11200 bytes
SHA-256: 406805ef86ed49cc4b1de54ac42ed96627944dd8a40a5f770c8b1fa7adb36db4
font_02_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 17332 bytes
SHA-256: 6fa6e5c5029c04e0ecc32b658d0dc4a0a8380785f1cecf1bfcf6fe76d720ce0a

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