Malicious PDF — malware analysis report

Static analysis result for SHA-256 4693e664f8064bfe…

MALICIOUS

PDF

81.1 KB Created: 2021-06-14 15:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c06445faa1ce55b24ab2bb4558c18a3 SHA-1: 465c02fa2f98eaf677f9e1cb79d73b95ee39e7a4 SHA-256: 4693e664f8064bfe148d027d4e47039e92558fdd6996cc9113e1e7c45a5e5af1
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 numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The embedded URLs and link farm structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=latest+hotstar+apk+for+android+tv
    • http://okmarin.ru/userfiles/file/48245634815.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3080c9ca3f29b2b7db36555679952b45/xapakivefupoditemabok.pdf
    • https://kham.vn/userfiles/file/vojenupapatukizesul.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42449e1c1---kixemuj.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73d919929---69288458723.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/zifovixelifukiwonat.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7992d2aa5348534cd8bd15bcaa2e01f/sasilanixisinabares.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/o59bltkfr4pg5p3800nom68su2/72518410503.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5c4e5853---51554844706.pdf
    • http://brandnewgoods.net/userfiles/file/88841054035.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a565d31a---59451182418.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/dd7d6dac039e5fa0a1f0522817da71c4/36966807718.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5cd8d94b3332a1049ded76404b200254/99497872783.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9qvddc8t5p2ipn40j2djt8jqh1/41442754546.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jkq4e8h6503enp7j8nvrmu9f49/gudugevevogasilulapozulad.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_off0000ffd3.bin
2e251bd89da41c03f34fdd9e9a7023e8365bc8d62977694f7f314b4680b26804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 5160 bytes
font_01_sfnt_off00011167.bin
e6cfba436e3ef429be8b928ff4cfda72d683f23f641be01ad5466fa6b8ac99fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 11312 bytes

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