Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33dd52b0a16991b…

MALICIOUS

PDF

138.0 KB Created: 2021-09-02 18:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6f1fca145f4d0aabed260ddbf188125c SHA-1: 6925ea92e1771ec6e75945b48f00f7fcec740b68 SHA-256: d33dd52b0a16991b9208ef06d94f0118b3891ceaefdcdb0de163c10d86b0d41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/oj0988sho66tssf2646215kcvq/pejikaxodinewome.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938722363b3---rajotatopekajosoxegiziz.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/18313463297.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/62983935619.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/zadevotowu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/50829131277.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1305852f---regeneminojumeluvu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/vexogozerudinovivumoxe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d755183dcbdce1a28884483a31bac7c1/59516259377.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0ae31c3a---dezogazo.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/55042801241.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vajuvidilafidupu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8c8d9006aa7ab6394adebcae035e08c1/9878164928.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m2ph8a8s7df90ojhn6q7qdc326/beropubanokalewitavofire.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ff240b3e1---31471195439.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/gatol.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/viravanuzogiliwiridet.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de07ad4aa70---pizexakibosivosopol.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/29870505921.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/wofuxubalilogupofokojano.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/diligopekevefevoxizef.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/77306448006.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf5288f04---xifobopap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=honda+cb+600+f+2003+service+manualPDF 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_off0001b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52A 11420 bytes
SHA-256: 751cd1a21aa2a010489ec933cd3b7c7835b9f22a13a673a7c444b842752fd83a
font_01_sfnt_off0001d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D01A 19144 bytes
SHA-256: a2afe0b63e4724644424c2da5c7aa2e2f9d25b93d8f75bba6a0388b943b710b5
font_02_sfnt_off000201b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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