Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc19c11aba8c77…

MALICIOUS

PDF

86.2 KB Created: 2021-06-13 04:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d06b0d098ae09f51e2096e4ba2be2de2 SHA-1: 0baf5ea97afefc55a9e68ab54480a5dcee08f40e SHA-256: 87fc19c11aba8c776f2881313f0f5d50e135414ed088177497c16fb370412445
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'download game tegra crafting and building mod apk' in the query parameter indicates a lure for potentially unwanted or malicious software. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=download+game+tegra+crafting+and+building+mod+apk PDF link annotation
    • http://zaun-produzent.de/userfiles/file/vakixepoxagegusulexa.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607018abccaf4---bubidexavaso.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c5414a8934822ac845c0afe44601da8d/sokirid.pdfIn PDF document text
    • https://jagominum.com/contents//files/34557590787.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/60573681416.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e12ddcd04---visudemizirinunurili.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812713b0b1f---setumapurupafuwul.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d337246fe---51676443463.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/29373a1c6859be4b805c717be49a4193/91167348657.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j47c2273nasu1egn2b2jm3cd7v/ropafaxufifok.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/98b086f4eacacbe98e6845c99b6f4954/28701109053.pdfIn PDF document text
    • https://triosms.com/userfiles/file/14621527181.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17d4354db5---giliv.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4dp7kapg048ff9ggf917fop1i0/37152624417.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c4uk2hj5dturk4nf1g4kbkh77n/vezizu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/631daa22ff1409025a4f5eff4a267120/27575474633.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/janakirepovixapoxogel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 5472 bytes
SHA-256: a92c9ce4303bb9a5190c2a7dd52f97a9177e86045693698397c9cfcb3b2e744b
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 14624 bytes
SHA-256: bb33cc9d38d51f89e2e0de0ed230d7c33e2f5dcbeb3b4654ad8f04ae94f60ed2
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16164 bytes
SHA-256: 0ddbdf075a6b93c30840c956f82c28930afd570615945c5f10d387cf6e2c8926
font_03_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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