Malicious PDF — malware analysis report

Static analysis result for SHA-256 567206be17b565d0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 20:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 380942ed3e40efc6cfb3a36fbf291c1d SHA-1: dd950f89c5b20c6544a687530f04f0afc9e7b192 SHA-256: 567206be17b565d0a1be5469c5e38a2a344446f6d546e7399ee30d1248608413
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=types+of+boundaries+worksheet+therapy PDF link annotation
    • http://aquatrustfina.com/userfiles/file/lewovaf.pdfIn PDF document text
    • https://artenika.pl/fck/file/jedotefotokexopuwulevurow.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/25616920477.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7d9496e961831adbb40ca7072ad5ad74/sabugom.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/wudolen.pdfIn PDF document text
    • http://laserinnsbruck.com/static/xilafejavixupigalofojepen.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df94ea82b---52861863920.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e41ea1f5b---43520117559.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9198d39329---pigodalulusux.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/movukiforixudifaxeteradol.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/45845621223.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/neloterugegezuwuxorit.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1d5a4396659fa4bcc3d11d0da0ce6bae/31097554762.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/559d46bb9fca3dcdd1e8c9002eaa4f3c/93406882174.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4bda01c0---49066032838.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/fodebujuka.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/levare.pdfIn PDF document text
    • https://isleo.com/i_photos/file/peruxowatowasom.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/28025359124.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/76986887471.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xewupomuzomofabaxore.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/53241785975.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/36087222450.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a865f9bff7---woxoxufolilapikovobibepuk.pdfIn 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://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_off0000baf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 15580 bytes
SHA-256: ca872b207711703db3257d1dd593ab95c1768b2b1bdbfb95bbade3d7ae2c251d
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 11044 bytes
SHA-256: 3b2fd8124f22dfca14cace3937d0e6191a563e954dc9298bb81326ef9aeaf2af
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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