Malicious PDF — malware analysis report

Static analysis result for SHA-256 0516ec38c4d3a1ca…

MALICIOUS

PDF

75.1 KB Created: 2021-06-09 23:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01891bd4270bf9e24177870c752994de SHA-1: ab59e059f65ba5be204bf3cb770be3a45a0bcc88 SHA-256: 0516ec38c4d3a1ca1b71a370f1dd4590f17695169a71a5f7664bdabf607fbb2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and URL patterns are consistent with known techniques for distributing malicious content via link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oniceh.ru/uplcv?utm_term=manual+for+raven%2527s+progressive+matrices+and+vocabulary+scales+pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032a934de3---xirozemupujusolil.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f8ee19734---sazozigazuv.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7039fbc9---xubiwi.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/teletavo.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6d98e681---manif.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0a93dc4d4---mujawabesisenapukuzo.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9afb7db9---36269472182.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b8726ff97f0e2b5654bcd58a9657c362/guluputujaza.pdf
    • http://aep-tc.com/cache/fck_files/file/52271877083.pdf
    • http://lungshingcentre.com/userfiles/fitixutijalivekefakam.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6f83d919---regirewefug.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f0cad6e17---92180558982.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d88c02ceeb915a7619203f496bb9582a/11566332712.pdf
    • http://hysansam.com/fckeditor/userfiles/image/gopigujabezagozezejagoxil.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071494c0bde4---bibivijadivodaveguzesizi.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9e3bf2fee66efe25623d14ede07f5474/23782875309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a6.bin
9ddb54db4b5204bf4916b46d08fe4f4954e6fa7a60f7a809a19c439252bd39ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 5816 bytes
font_01_sfnt_off0000f983.bin
f4709bea117bf2e8ca01523a188e1627fce914149e10b853a17fcd5fed61299d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 11032 bytes

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