Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb239d0ad48472e…

MALICIOUS

PDF

86.5 KB Created: 2021-06-14 05:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 10d8f9183649f6aa38da0d5df9f99217 SHA-1: 5eec67a91aa43f60f1fe84ebc83a8dc8595fa7b0 SHA-256: cbb239d0ad48472e8d00d40b333e8e32835f3a497bc53f3fcd644bfe8f4ee670
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=jigsaw+puzzle+ppt+template PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb370422c5---sufinatabefifek.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085807b18336---46591657333.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ab460e3c2a5925edb4d9c9117cb91f56/79077771343.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kisitugokubirukafol.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f123d91f---33700172884.pdfIn PDF document text
    • http://askort.pl/Upload/file/66593570300.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204e69a03e---ravumafumez.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/45896889454.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d2fab16a402cc57ba55de0d54f379b2c/22655506777.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7db6bff90f79997f151eddd91cd2cde0/6984698562.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460c84f802---70526917165.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0fd46be8e9cc4e607a598fe5ad124be9/88127767066.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98c9674ab---telajupemafurefo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/milubalevupape.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/69163339085.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2fe79715f4320a097f1438fdabcc517b/robib.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/metonojojaxakexesa.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/sowaxanisasodosewuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 4840 bytes
SHA-256: 1962ee704c5ab01c065dcb8fb835a12807bf2dcc9145eaf8fbf2182e29624984
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 11224 bytes
SHA-256: 1bea634c83341a480fe96c1a6bd865b0986e1c1ad4427676375b036e71df4619
font_02_sfnt_off00013f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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