Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc08f63f165374f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 06:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ef0b412029282a80b4da4a280c3d402 SHA-1: 321da10696f8e138c535385cf4939a18e803757e SHA-256: 8bc08f63f165374f698c50915cdf55cbd2ae7ca184ece89b6d58de6e903cd118
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/isof7ge9a0jk67go9ss2o87mv3/76285713615.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/83733868102.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d732f86ea00---94903079358.pdfPDF link annotation
    • http://jmvlpslimited.com/ci/userfiles/files/98763499425.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/74088835652.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd72ef766---wenasodovujaravawas.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a09f4fd27207ef95f2604f95672e22ac/lezolakoli.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/fovevejonasiduxuk.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/00486eb26f44268d2bfa0e637e4c2ab6/leziv.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8451375eb0782fa3072ac5d94b37670e/93613495560.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/48f21a4bbd4ce089a647874bb0d9c417.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/wijiwolupodiwaxetulin.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/30903560626.pdfIn PDF document text
    • http://nfc.soo.jp/file/35270355750.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed27643ad---zewadasiwazin.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/65271854305.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/30168712710.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/wulavevavudukovilutazev.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d98e3cacf71f0306cff9388dc8aae216/58881103628.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pukowivej.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/44571671690.pdfIn PDF document text
    • http://www.celso.org/download/zenafuwosafinikowo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/44593e8153fd22b0d93d2fa46aebd050/sevonojamokewovepa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b6ee4265a654c98d545461cf46fd1dec/87065356585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=immunology+mcqs+with+answers+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 11464 bytes
SHA-256: 18789a6091b869643589982b243c67c23786580fd381b241089235833d1c06e6
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 17228 bytes
SHA-256: 131ae0e225e430df6decd03223fa464ed96ff6ccb53d362e8f3816213eec8673
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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