Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfc1c0b66d10341…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 05:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f897f8771bd0b40c639f4e0376c3544 SHA-1: 3af165896ff82e30f0c7b0e6683cbaaa61474312 SHA-256: 7cfc1c0b66d1034152f054e64247aa8b712da2ae1e73629e0f4c7a637c804b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document, possibly exploiting a PDF vulnerability to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://wo-kop.pl/userfiles/file/sogozunaw.pdf In PDF document text
    • https://mangmalungtea.com/userfiles/file/xoravene.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/57220901241.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607370e63f128---silevamuwopozevipaxases.pdfIn PDF document text
    • https://linker.tw/files/8428231240.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/37890841149.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26403336266.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lakozituparokunemopume.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102c63e3ddb3---19536724593.pdfIn PDF document text
    • https://shibbirs.com/media/files/99257061552.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/109974ab0abfe48ded85444ab19c5aa6/92878897.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c34c30ba479290093753cedfbf22b43a/rulol.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/73552432303.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/lafafiwemidapevuza.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161002fe16fdcb---soboduxegaxej.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/28440459129.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/83942845046.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c13046e9---jirut.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/99140859895.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5i271jiagk3st1g5v8jq3j9v4e/50212818005.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/77ec3ae61b8aa984b35f5e95dd4f836a/sodorisa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3ad4da17---52867711783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lacerte+pdf+printer+repair+toolPDF 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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 15820 bytes
SHA-256: b29154eb9aea302f5fa1f1489cbf094a7923d899f553fc0ba6820cf996a98d8e
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10400 bytes
SHA-256: 27ec8eacf91cb5d6c7e0d3fd954479650a46efb158222a7f03da3b20b91d1a60
font_02_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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