Malicious PDF — malware analysis report

Static analysis result for SHA-256 de957a2772d60ee1…

MALICIOUS

PDF

80.2 KB Created: 2021-06-17 10:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a15437379c9b291ef6de55d8a42440 SHA-1: b05f2d90cf11ce4b5e19755a35ff7d8ff131157b SHA-256: de957a2772d60ee16483288cdb8dbcae14f13cef241429c36759b9b6b43ccb52
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 appear to be part of a link farm hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV strongly indicate malicious content, likely a phishing lure or a downloader. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content.

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://inwebjor.ru/uplcv?utm_term=online+video+editor+no+watermark
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1a28f4c6---pinota.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160884edfb7932---rupazuwakotitekararubi.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4874935535b806f9c78f019b2a87198c/guduwedigofilar.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f08c558cf01854889260a1adc2461492/sobuboxixetituvezelusino.pdf
    • https://an-professional.ru/img/files/file/89319631772.pdf
    • http://bebelino.ru/userfiles/file/47701014773.pdf
    • http://intergeored.com/upload/File/jupakaxejuzanupitutojo.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4f38ac884ddd25c558143f8cdd85632b/81453728359.pdf
    • https://daotaolaixesontay.com/uploads/file/guludopavawigewitetisa.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2c516ca6---muxudo.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4uis0qg581ujj30lq5ful9e93k/nuvuzis.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c12b7d701---fefubo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160774ada0dcb0---29256415868.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ee30623b370d7780c3c396e6c314390/ruxaxuj.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/gofukogasepotokebadajok.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/efieooqglbrustaq9ei8qf8i7v/rapodakeliperepaligo.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_off0000feaf.bin
19ee9a775fb5014faea95b122e01f0a2ed0f1b67c13c48dd2b1cfd0162aa9da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 5036 bytes
font_01_sfnt_off00010fd0.bin
a2c353bf631ce3fcf140a4b5de0dd9d305c1e650ccabc66d4b28d5f1a2ddcd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 10572 bytes

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