Malicious PDF — malware analysis report

Static analysis result for SHA-256 974149ea00a45c8c…

MALICIOUS

PDF

94.2 KB Created: 2021-08-11 19:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8fa4e52aa7a68881321f00f9cdeba4d SHA-1: 853be99ca0dd6f7d02690b664bf31c91d44cfd48 SHA-256: 974149ea00a45c8c405ef3cb454191b64bc03ca5f8d77ff4306a1d90c5738be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the detection suggests an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1398c8e709---78485038070.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/jeguwafavalosexenedub.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67370be7e---jotalitativanojifevofipu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/wilonafedofil.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/37ad11cc23a81b2e111b0358a95f1a6b/26488159410.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d291ab6940---serizovudeminu.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/nubazigidapu.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210731064656_i1podo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/84537554994.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b95efa8309b1358b17ace1139ec00c/vujukapenesapo.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/90496014640.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/10717387749.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/numenanudelokosubobika.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zawewili.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/352b60091d3985bf6db513834162feab/bedagibinikubumafixuwak.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mosadegonivizemuxatapip.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1566ee1ce4a58407308d3180963fe6ed/40364293516.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/dimarunaxizig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=paginas+para+descargar+juegos+de+ps3+en+formato+pkgPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 19632 bytes
SHA-256: f1825d56f615d816cc13de5ab402605f251561db4c29bd3e3764b22a260a7dd7
font_02_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 11412 bytes
SHA-256: 3f6ca9eb8bff297ff7d42e806084eec656d0b8d0fcd0aa7abf2d2f24eb3450e5
font_03_sfnt_off000150f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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