Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c4ba0a4a9b7a1…

MALICIOUS

PDF

113.4 KB Created: 2021-07-27 22:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73a26c9a4b69ee9ce51ff0d43f9c1ced SHA-1: 5fe9bf12248a519f455c12a9f3eccf0263f56892 SHA-256: ef0c4ba0a4a9b7a1e559f85e09079b1c0858afe4798882d51e5aaac02e26d5e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9455d910a9---xidibomig.pdf In PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/68933458143.pdfIn PDF document text
    • http://dsraxys.com/uploads/wawumofapafibipujuwira.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wivamevabuvawokiziv.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/210356501479.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/vupilaxujudarobigozoz.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/70729755964.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/nemaj.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/60036551327.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c2a1494d2f83b6a156eee842adc1cea8/wusus.pdfIn PDF document text
    • http://lyshiying.com/d/files/gezedumez.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b39ab05e---jafumabijozapetigini.pdfIn PDF document text
    • https://maisonforville.be/documents/file/lotokefaz.pdfIn PDF document text
    • http://aps-mes.com/files/file/99468241273.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ef91b80b---69410326632.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/2588909240.pdfIn PDF document text
    • https://advik.net/userfiles/file/81741226302.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5d3b904865c55de909867c031cc0217a/giderelu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/288920d5e32b5a13131a7740ddbc5f8d/kixotakuweririrab.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gegaxadib.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3efdabee3---48224190894.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eaa468990---gisawup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+holy+oil+used+in+the+coronationPDF 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_off00015b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B40 16876 bytes
SHA-256: c8809cd5d89b5d198475b890bc20ae27c3b90fe93e2723b81793acbc285302c3
font_01_sfnt_off00018703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18703 10672 bytes
SHA-256: 6a1ea41f334c36158ee9db4c02c3f855bc443c3ccac8a161134ea071843ad832
font_02_sfnt_off00019f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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