Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a391cb7670a3d…

MALICIOUS

PDF

92.9 KB Created: 2021-08-06 14:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 441220e91a0124e4af7a07819758eb2e SHA-1: f173b2852aaafbe8d57ea1e40f308a47827f2e97 SHA-256: 359a391cb7670a3ddb6cf8eae9db79ea80c5d7d929dc95037304b84092568f9e
164 Risk Score

Malware Insights

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

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 a large number of external URIs, many hosted on compromised or disposable domains, strongly suggests a phishing or redirection attack. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://manavpublicschool.org/manav/userfiles/file/kojarevovijifofelasugumi.pdf In PDF document text
    • https://gamaconsultores.cl/upload/file/8822588522.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/1a34e3e2f0927d450eb51ceeec330015/24102505356.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210701053918282783hyxzf6.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5epp5vhka77supju5g193puj3/52182750827.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520235239911485.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/73238638346.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105201842151310.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418563b395---xifumudujaridifusapas.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/nibifawedarisulepusim.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/83850544624.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de111566ba0---tujugemazifebi.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/reloxazugiwaduxizegodana.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b8b7095f32fef1a8b9b2a0e46c5bf920/vizodiwajav.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d6daf43d4bb93e3257a7e0e65512bd54/niteruvajatuworerew.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/riluxazizixas.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee9873747---guzeje.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h91g1tn5kk8smd1otk9oemnedj/59421427779.pdfIn PDF document text
    • http://bdn10.cz/files/file/44826354126.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/gizumoxuzufenudikemi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28921e63c---fubizidibap.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/45612676358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=software+lindo+programacion+linealPDF 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_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 18788 bytes
SHA-256: 1fc5dce41e22d3d24090522a27a19ba06fa634e29a2f6616106988d6f24c372a
font_02_sfnt_off00014a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A45 10956 bytes
SHA-256: 823884841788e4ab557e5ba74fab88d45288c29433b92696efbbc367801833b9

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