Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5f384bd862b9b0…

MALICIOUS

PDF

84.2 KB Created: 2021-06-23 03:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fb210f9c7d1d0f55d1a392efc77aa672 SHA-1: c3c2c93bde15218009f9624bc96370b5480250d0 SHA-256: 0a5f384bd862b9b06bc57480f4edfcc58cea1ba741e44a7a84fdc0079b5674e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many hosted on compromised WordPress sites, suggesting a phishing or malicious download lure. The presence of a "lyrics maker app download" in the document body, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing campaign.

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://queure.ru/uplcv?utm_term=lyrics+maker+app+download PDF link annotation
    • http://hakkabrothers.com/userfiles/file/%5C/sawaziweviti.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/menufusozunoviwe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3625d4478---xodep.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/97752398538.pdfIn PDF document text
    • https://advik.net/userfiles/file/tarisisutanebaz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094356f67f72---64615912783.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/140172938afbe346b80d18d2ee7558d3/xilobuwefobowumesonasiti.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f4c778cea18b2b06dd9b0201646dfe5a/kesigatagaba.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0326b305db---4673060567.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a82b480b02d2e65612a8bdd5e9520aad/44421514806.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/17c7b6852c922bded5a1bc97060fe8f2/83267416918.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc32d6b44---14646846147.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae33fb6d73---duzobofudaliziwebus.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/90571211589.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/10729153466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 5416 bytes
SHA-256: 5144c6bc3e595b3764a45fa4c350c4a6c4bc440defa6842cd888938f46b96e36
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 4484 bytes
SHA-256: ab08e9e14c7e8fdef23f88eeb2b89995617effa2668a2a6da3cf0a97defc4921
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 11492 bytes
SHA-256: 8ebfb87167789f6a931900b05355ebe49b113acb1d76660fe0ac6d3dae0902a6
font_03_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16380 bytes
SHA-256: 9c71aaea62549e89be2b80026e8552e529abc9849e27d4ac1176ef2fe88b9bd5

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